Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53424e9b6b5ae11…

MALICIOUS

PDF

74.3 KB Created: 2021-06-25 21:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e843556407a89d7b2b301561e03fa91 SHA-1: 512b36d37f1d15d75cf5c55be965f113addfbf71 SHA-256: a53424e9b6b5ae111d815eca23c92ed38a038a0c50d01af952767239b0511842
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm pointing to numerous compromised WordPress sites, likely intended to trick users into downloading malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly indicates malicious intent. No scripts were extracted, but the document's structure and embedded links are designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=download+s+chand+chemistry+class+10 PDF link annotation
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd61bc57f---taxar.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/gujb6flq6mo8r15ei5d9nues44/mopulanuruxegomoxafu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cd7a4a0f90844868ac6b4a501def09bc/73670003378.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ba4a2cca---14961431949.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/f99b5b2ed2678bbbc1986b6150cfc025/gativetewatilunuzug.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/dbe40b27d35cfec68c2652c8ca8bff79/52958653166.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd019c5e45---gizejenikijumewoposasoki.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82d81a24e3---nagosoboxabosame.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ae4ab147---86278451209.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0779ac3b---dakemakikefidupavivepuli.pdfIn PDF document text
    • https://robertbah.si/files/file/tawewaxosafosisini.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99a3fc69f7---83442902266.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0f6c3770---63654735543.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/garatolepiwuwudomas.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/zudapa.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4707c7beea---77283105330.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ca583dfedfe18fd5e60117b79e1508ab/sulovazuwepuvimexafunogin.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021062108530573499.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3b5487a344cfcc3140f9e366a9fe5c0a/ketotadugasovizabexekiz.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/95807858689.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/41371353838.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed3afaeef5---11146702076.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c909b6c3f---31636029090.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732d227e9a9---ligododofobalit.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c8ce7631ab8054560aaca6bc013fedbe/ginobunomoxureguge.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/lolarumegapajokubigop.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40291ea49c---risadewoguzikigoronum.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 16304 bytes
SHA-256: ee3c91d4ef3583f5df3d805829bc7f987baa997df4d0f28176c3dd32c23a82b3
font_02_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 11012 bytes
SHA-256: bb51a1547ac7990a5aa4606a882dfb105eb18a66b3d25f013439e1950bcf70fe

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