Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a34abc7774fce95…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 11:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16f5da806119826c2808f0d253fa3de2 SHA-1: 7aba09d07d57a3acea350b17c9b1bd5f20acedb1 SHA-256: 2a34abc7774fce9562ec6dcdcbdcb79369d5a1866a49aa1e0c1a7b63670abada
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it is used to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://odesignlab.ru/admin/ckfinder/userfiles/files/rasufirosibol.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b6ff218a53223705a3e41e6cb8779892/49805827762.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/47337378015.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/31678495757.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/27058406747.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/gepegovu.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/55218583116.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/84571842610.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ed17822025b7ba9c57d56a2c3200dcdf/solalujojovedokufiboludu.pdfIn PDF document text
    • https://marosme.ro/hirek/file/rebuniwebetoxibonapez.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1903091a4---77077491169.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/dce6258fd44fdce6c43d99c8f17a79fa/95460810245.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/bazubetubolul.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/26113626209.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc13d00fd1---59713659135.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/61815808995.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/jojonolebenuremapifu.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/43048805616.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/wimupijimoreroxu.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/4cfeec57561bdc5d4fc3d35e68f39f7a/92968347982.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/45032177893.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f22649f2a---32482867367.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/98667569253.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/39620475728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=journey+don%27t+stop+believin+piano+sheet+music+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_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 19180 bytes
SHA-256: 191fcee7f4113016ef57a6201ec79de55817bece3347e73f40ee880723ab9661
font_02_sfnt_off00012f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 11328 bytes
SHA-256: 2f47a8e93dec8b5dfa89cf437e31b19015feaf0526e25175f5e4c39a7877d461

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