Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3979b61af73e82…

MALICIOUS

PDF

89.1 KB Created: 2021-07-13 17:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4208aba4f7a7f379365652c7507481f2 SHA-1: cbee4335b21507b6318c1897a144c2dab7bcc2b7 SHA-256: ad3979b61af73e826a8ba6853abf4cf21e8f267d01e9c2ad98d818295674d897
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://accesoriosalmayor.com/images/userfiles/file/2257476151.pdf In PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/geluwibeduziwenatejupixa.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/jafuw.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/garoz.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/67087443930.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/zigujavezimofade.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9356df158c---jipurirejuvipabavene.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/21305825385.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/c92r9146j71288lpsn8c3b5bjr/deviwitixunamidugovo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b91a67c63f2fa41045e79b958d63ff5e/ludos.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/19403072292.pdfIn PDF document text
    • http://jaatkinson.com/userimages/volomenovamofas.pdfIn PDF document text
    • http://capital96.com/userfiles/file/gakovapozojoxufi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/o7vh48n1lr84171i6m7fkcqeo1/vurutifogudexawoza.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/25ec4f531cb059acaca667d1e25d99e4/wadaxizogepor.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3fa8a8d99f89bbfa31b55e520349f59/dorofuxewukaku.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/tudinivizavupibitetuzase.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5795f8f28c---pegilemiveweped.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/30668887845.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca13834e81---dopotilojuko.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/rokipetop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=black+swallower+factsPDF 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_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 10364 bytes
SHA-256: ebd166e9f69098e16624ee4e4334be890981d68deb58dd2b76822a214f56e729
font_02_sfnt_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 20120 bytes
SHA-256: c644b4dae89d7013ce45d58bcffa4143f708eaeee5485d62c0d5fdd5eea9bd61

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