Malicious PDF — malware analysis report

Static analysis result for SHA-256 353468d63f05548c…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 15:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c911272984a2fa030829984acd965388 SHA-1: 5b13bc0f5f1180ca1ca1b81cf574a0769b72e9c8 SHA-256: 353468d63f05548ced9d91b910e39ea9a03359dc807a103a103bb8baacc0d1c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a phishing or link farm attack. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=quantitative+versus+qualitative+research+pdf PDF link annotation
    • http://hyperasp.net/userfiles/file/nejefitaxedavaf.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/po5rit0ec6m17gmm282djm24rg/13880581120.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094661cadf7a---puvazamurotewit.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/jelivukiwijafudum.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a313fbb439ed3f098b7fc0adad0ff956/34739591397.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092edbc1b23b---givurusekibojaki.pdfIn PDF document text
    • http://limoride.net/gallery/file/62694959810.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/zuzarerapeluj.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608756d043cb8---54547103339.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1f6bd5475---89162144849.pdfIn PDF document text
    • http://darstin.com/userfiles/files/25335829695.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16093c71d918d7---buwep.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/fa59e2a21c3c11e487e043b66b868a32/46139921059.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/88100373346.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/80210262044.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/52470075394.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/teziwegalunopilafuzel.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/90258483325.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/6e77f6f5b1d874b541092502157e80b4/bupukosofefapumaramepuve.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/luduwalemipakukudavi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4752bcd936fafaf0717d1966a49b9857/40434835856.pdfIn PDF document text
    • http://palcev.ru/userfiles/file/58811250159.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc139b2861---punumadulowe.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607df26845231---9555540242.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_off0000c131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC131 10968 bytes
SHA-256: b6a78fd8777b55c0be788f07818d324aa179ef27dd8eb6aaf113f8766137f9a3
font_01_sfnt_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 15456 bytes
SHA-256: 5bc744aea0a78aab371a6f481cff7609e4e66d623b63b857820ed86361677dc9
font_02_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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