Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1119c5f5e6f4542…

MALICIOUS

PDF

77.3 KB Created: 2021-08-19 00:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fb0c07cd2d95e85a7f13af8ae9b592af SHA-1: a2bfd9c696be51050699a0ae428a76d31bd90503 SHA-256: c1119c5f5e6f45422c982ff2e2fb9d1c65b646f60114dfca1eb34a68c39a3c3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://brmxn.com/userfiles/file/20210719041942_9h1ygc.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964938b6259---tunedorefu.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/43ae470d2f6802246e4e837133f8262d/73841413697.pdfIn PDF document text
    • http://splogservice.ru/content/file/wolosozirunule.pdfIn PDF document text
    • http://bjjiffy.com/upload/wepimowosimanawukigexum.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/21276089199.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/55389068512.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/2645ffa541ce491daf4acad191687e1f/punerazetidinemito.pdfIn PDF document text
    • http://flavourit.com/uploads/userfiles/file/file/74867637621.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/vdoroheru0vk5quacu0g1mlr3e/62739588901.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/letobivovakone.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/63600393312.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/1a7eb0fe5c6b86b3a605cc1ed6aeca70/warogojepazazejuwo.pdfIn PDF document text
    • https://inncredel.com/uploads/98322903920.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210725/file/16272144722652.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/poganibabo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8a9b119fc---20639285196.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0dd0524406da3193687485635efd14c5/33449782618.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/74508927175.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/4264183598.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1f07914ca---rigivuzukav.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/vodiwajusavatipofix.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/zafarixokuzak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=all+tenses+exercises+upper+intermediate+pdfPDF 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_off0000cc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 10844 bytes
SHA-256: 7517fb96a0d44d8363ee15d7b6b713f9ec399a6876a30b5902ab2a086edce358
font_02_sfnt_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 16120 bytes
SHA-256: 58d0bb5ea20345e568d8106954e085a8d350a72418e353228611afa6a8ea4e97

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