Malicious PDF — malware analysis report

Static analysis result for SHA-256 2476ce3d9caf2c19…

MALICIOUS

PDF

91.7 KB Created: 2021-07-31 21:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9f24099cf1badbf2fe1238bfbb696650 SHA-1: 212f42c59e15a690bc084f8a74519be6bde2eb34 SHA-256: 2476ce3d9caf2c199355eae4ec9feb1ccaf43344ba04a55cf4c2bc894332a910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e29e4e99812---48987398413.pdf In PDF document text
    • http://astro2sphere.com/admin/images/file/zeridefazopafipodof.pdfIn PDF document text
    • https://ewt.cz/res/file/6442091317.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0bb448daf---69024091626.pdfIn PDF document text
    • http://atomleasing.ru/media/File/38875079866.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/gokefig.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/24503102601.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971b6e5e70b---9183571923.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d4e9d25adee26bfe77fe6c58d21cb301/87212428513.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/24683119688.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/kojatevugoxakid.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/juzaxujavutax.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f224c1dc7182bfbade1f9851abe63a9e/zabaxoxiwugozi.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/vodogepotedadudidexe.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/60600713469.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9fc04d4eeb9fc6c69d808b8b0eb8ecb9/79059961640.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b67148c5fc1---vimobib.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2744390a0e---96175361538.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/aq6msq0jcn8r33l2tooiv44jt5/gikinuluvogebaxoloramibo.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/zexavurufede.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100fc80b096b---84240523828.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/1ebf784cbaae145f1cc324a5d71d3ff8/verupemokixisipovof.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb58f800e0---paxexelogarubujur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mise+a+jour+autoradio+android+chinoisPDF 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_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 19912 bytes
SHA-256: 34fbc3b64b54c3bacfd843261eef1403fa0f12f135fb7c1c975a12d7f1acd4ca
font_02_sfnt_off00014668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14668 10644 bytes
SHA-256: 1d1b08f041a270a4ca876959b02e2b73dcfee47d8c98bca5a86f39f281d7084e

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