Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcb0d7401633659…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 00:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 52d2d219ab3ae85f6464e9988d3f41a7 SHA-1: 66208171c1a71d7024ac67b538940f6be5ddf254 SHA-256: 9fcb0d7401633659f8ece6206aa70a830e50e1c6392ba027f988faccfdc6f2fb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links to potentially compromised or disposable hosting sites suggests it is designed to redirect users to malicious content or download further payloads. The heuristic firings indicate it functions as a link farm, likely to obscure the ultimate destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://adabaskimerkezi.com/upload/file/5107651688.pdf In PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/tozifizatewewetabukezu.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/ximezodopemitoril.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160962bbfc113f---safamipiwelopem.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/boriguvavefemejododinex.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d51e33f84---bitufaf.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/zivuxotiduf.pdfIn PDF document text
    • http://firegallery.ru/img/upload/newubesuwodokajuxawuxa.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d21e010a1e760ed317af5cec74974c69/nopabogikusipege.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/wogugotosopekeguwato.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021042902512258.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/rivojosusufilonifaxi.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/9f20fdea0a5976bf17ffb54625efae37/pegelarotumuleti.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/39656377028.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/89262291496.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/36332752687.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/68991476399.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///kurexulal.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977fa65b6f4---gakuziwilunumubajazifesuw.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bb5a84b9f---54435108965.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/59333390143.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0c5c6410---52870939681.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/92440648715.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/pewuzokufelemir.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050410446723.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f4c151ce53dda6bb01e8399ceafd8b28/vugiduloxob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ecocardiograma+neonatal+pdfPDF link annotation
    • 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_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 10776 bytes
SHA-256: a0e1b5580cfcc367769cd9ca41d81527ee10bd4fd81bd52be95bb5cf790fa585
font_01_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 18748 bytes
SHA-256: 3590b87edf00c4038c60ca8bf399c372b39b1cdfd7c709ca270ff3af420f03c0

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