Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d3ab6916a8326a…

MALICIOUS

PDF

74.7 KB Created: 2021-10-09 21:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f63e3691653b6c89e1060dee45ad7530 SHA-1: 37c664fd1bc5da75e571a1bf59e05528c55ec02e SHA-256: a4d3ab6916a8326aa0444d202cb5da53714d639f82d420cc6d90131fd343fe79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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 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://laborke.ru/uplcv?utm_term=we+got+off+on+the+wrong+foot PDF link annotation
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161432696a7a97---55902219814.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/kumekegikivuduwuvimesujez.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/wodefiwab.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3a6235cfd---tisupu.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/5007659577.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614457005c798---93313325467.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/88346459765.pdfIn PDF document text
    • https://koratspring.com/upload/file/78407761345.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/kuparigavimakejulirogatug.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/92746631483.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/62986993173.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/94484971553.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/87119115780.pdfIn PDF document text
    • http://anm-av.de/uploads/files/67875001403.pdfIn PDF document text
    • https://dutchhaves.com/uploads/files/202109301431272438.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/zevikunovubapipijizem.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/483f93d4703d7d4924f832305f145492/mavubife.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/22100250504.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/202110218235169.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/80339979829.pdfIn PDF document text
    • https://xtremefitksa.xbodyksa.com/ckfinder/userfiles/files/nitexuximi.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/bokewi.pdfIn PDF document text
    • http://insk.ru/img/userfiles/file/93830695390.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/76654941549.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/41469051432.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/21884454046.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159e55d72e1c---48511495898.pdfIn PDF document text
    • https://meridianchem.com/meridian/ckfinder_userfiles/files/xofujileto.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_off0000c4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B4 10104 bytes
SHA-256: 6985961ddf4c928fb09698ad78856e2ad5964ad2527bb63b1f5ed62642487c52
font_01_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 16364 bytes
SHA-256: 3964f5c2cf3cc60fce876be89108218e686d4f2fdeeb92825b1fe12dad2ab5d2

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