Malicious PDF — malware analysis report

Static analysis result for SHA-256 2835da04dd0981ce…

MALICIOUS

PDF

91.6 KB Created: 2021-06-30 00:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 73733257914722fd35bba8e19d1d1d07 SHA-1: 8afa965b74718a1cbaa7a616cbf4d08cb0383c71 SHA-256: 2835da04dd0981cef955c71633c2d83df39ce91585a91779626ce4a19a8c8014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=a+man+called+ove+free+download PDF link annotation
    • https://cplastik.cz/data/cms/file/91671015195.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/073265730fbc08bc58bbed23b23d3e4a/geravisutemezo.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/36019562921.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/57517048233.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/wokivibavujim.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609881c83af9e---sebediwutoteke.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/bns4snblkbck7qoq912q6lqqs5/zumaleroxixo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/4agovu83eendvrrrugjoio7lh5/48375724531.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/t3876ki4gvoblivm0v7lg0bqo1/zazaromenologuso.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3dvon9ndlqach4burargmcgj7k/xepeg.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/pisowubatojarovazuz.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/bizugugolupumi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d1a984f29---885792645.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/457ceae7dcf9124bc5019a4e621d049a/pugipokul.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8f8a88565---79835600864.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/99978953126.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/6903dc31dcff8ea318c37cfa7086ea32/88546647857.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ca9ec07d---53885981187.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/kajolupafej.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a9db53432b1153d89fa8858d60247ce5/tebediwekidovi.pdfIn PDF document text
    • http://webbuilders.com/files/file/78982087487.pdfIn PDF document text
    • https://aitalk.vn/upload/files/5925969233.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075544d32e42---87527429152.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/882e22365d9d1c2a83078d01b3cd261f/nefalogadavulegufurowib.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_off0001044c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 16900 bytes
SHA-256: a626a1fef8cffd843933b3db6059b19e213a5d5553c5cef4f338de446646c9e0
font_02_sfnt_off00014812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14812 10412 bytes
SHA-256: 8c4f983bbeb88da7d4bf51f971fbe25251f724920d135b3d0d1fd94a21610693

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