Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d12614f896de9c…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 07:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 336ca4bc5ee728bbb66fea2c769717e2 SHA-1: 354531b41f9850615b9e9982f5c747bb107f74a2 SHA-256: 64d12614f896de9cee5eda6dfd040c08e3bd4a907476ad88220fedcdd90b7d4c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=android+mobile+support PDF link annotation
    • http://heninrealty.com/userfiles/files/66348168492.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75cfe37cd---46386402125.pdfIn PDF document text
    • http://bdnchem.com/upload/files/somuwakuxul.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/robobenamazufix.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/xuwedegakomafedatizunama.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/58952477266.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/litofusebokumusaxudu.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/91669449030.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/55124384670.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef3d6d9ead2af90f79a9c6fadbcba029/26039212390.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/18323742395.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/xupisuzosanopitu.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/26097671933.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613041d5709fe---bulupototizuwixikuti.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/12597116464.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/finifelutar.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/xebututerifuzuxuzu.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/fekovuwef.pdfIn PDF document text
    • http://regmac.net/userfiles/files/4569038268.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/49584420658.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/wajopenurijelepude.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/fisadipekugapobukari.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/44836189784.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_off0000cc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC41 17116 bytes
SHA-256: 63fdf72b7441348dac04a68136ff2b13709955bc802dfdd92def79edda743380
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 10612 bytes
SHA-256: 00c270b28c26b936aa7f8d481f3bb07e1f0663a9908552f77419cd537e9c332d
font_02_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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