Malicious PDF — malware analysis report

Static analysis result for SHA-256 844876ce49e3a35f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 05:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 202a689ca94c0c9a01758d6e16286e33 SHA-1: 45544e2514ae5f0969751f8fbed88a5fd159c284 SHA-256: 844876ce49e3a35f049bf177312f0589827c8f19279ff1e148174d70aaefdc80
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to host malicious content or redirect users. The presence of these links and the high detection scores indicate a clear intent to deceive or deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160814e731820d---26430321005.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161077d07e6c2c---tegurama.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/53752366890.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/23ab7d2e3b3aee224c3a97a93e986246/zotekikok.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/932to72icuf6rftisg23nbihl6/milupewuj.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36f7c9cd8---44774136582.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/34828360774.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d861cd99.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/89740506842.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c34875a90aa---jofurapolixafipaperen.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/825ef7fc273fadf7fad781ff1b2a7265/97856017191.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/81502254807.pdfIn PDF document text
    • https://triosms.com/userfiles/file/simotigibapuvujovana.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4be0cefe---xaxeronijimotanisaxavupod.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/44460440402.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/12621058257.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1486085283611e94e2d038e.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/vakevew.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/57333331683.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/93681615626.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160df56ded3905---72730115379.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829bff8d423---dedoxuwofikonuzovor.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/28615870319.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/jiwoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=inside+out+and+back+again+worksheet+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 10972 bytes
SHA-256: 76c80a591b0d46ca25f1621a2aeedf3a4912cf7066286226705949d58b25b633
font_01_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 17116 bytes
SHA-256: 788c3ad93ba88228129f8ab053ec3cdeeadcce933b9362cc952e92e61d3b44d7
font_02_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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