Malicious PDF — malware analysis report

Static analysis result for SHA-256 4487724f0179f469…

MALICIOUS

PDF

90.3 KB Created: 2021-06-27 16:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b1056fc2cc042ecde19d621237c7e78 SHA-1: 2abe82da9561d01b78fbdd9a1d9be96a6a7e3cc6 SHA-256: 4487724f0179f4694e7c8e0b04dbec8442ece77ebdaf70d35402c12f35d4cd5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload directories. ClamAV detection and ML classification further indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=high+protein+dinners+for+weight+loss PDF link annotation
    • http://strandedtattoo.net/file/liforazelamemef.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/42kobes4p7tsc4ls9ldjpbekgl/35314397467.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd940f1cb7---1922378188.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/wegipajojuduzini.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/29016197828.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/82569855857.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/lefivubip.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/41466519321.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/57965322522.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea24a3847---zipelaviramil.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3a909966---84760792725.pdfIn PDF document text
    • https://micsys.in/userfiles/file/nedegafusupukilinosa.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e499725a---48154115211.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b267219254a---pasevuvexelobisumigux.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/un1ffpgj901qr2bi1ivcov1kju/febipimazewaj.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/zuzepuzil.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/32298226252.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/b0h2ndlc1h8062dru88m0dikfj/surakunononiv.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/34581519444.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/833e3f4a0eb4ea98b70b14855fcda9f3/93113212836.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/85099968403.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9061ae3e---14584741504.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_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 10692 bytes
SHA-256: a4f59ebf961cc63f53abc95eee5c2cd4ccbacf44fa2bbe161f11f1b2eb4a19fd
font_01_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F42 17140 bytes
SHA-256: cf52544054a6dbda068406fa092eca1d2da1cb659aac30dcecedfad86a64db10

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