Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3e7f2b9f8441a2…

MALICIOUS

PDF

99.8 KB Created: 2021-09-07 15:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 705c9894731b3ac33985236f60efee44 SHA-1: f5e8b9def130d5685dcd3df30bee113097a6c384 SHA-256: 0a3e7f2b9f8441a299e4198e3e4a3c2b86d2f8a7e6f269aad63ec7e0449b9149
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://huntic.ru/uplcv?utm_term=tcpdf+html+break+line PDF link annotation
    • https://meesens.be/KrMee/Tekstverwerker/rifoduduziwebewifumafa.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/15180061425.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f050d2949---xisakazufusijoxexebedajo.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/tufuluvo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2aab50bd8---8680197713.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e50c0f85695---33456238161.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/4790152225.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/45390748013.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/30d260cb0e81927254e794f2cfb8444f/nirafozipaxag.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/xevojikozivowozawarav.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7067f1f6---71119728669.pdfIn PDF document text
    • http://metapolar.hu/tmp/60801376414.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/vobapojifovotur.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/savonokazawinijujuva.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/wimunujadulaj.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/biboruwajekelejukexak.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16116f74e08252---towavuxa.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/38246099313.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e5bd9250---48993784720.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098864b45172---rukudobobizezejudo.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/likatunidumolipigu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608103be6058d---xerozuvuzuzozirusunebexa.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/zetuxirumorozuzixanovejux.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_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 10792 bytes
SHA-256: d61d5507c6c8bba6742d839afb52f05df3d7275c200618e11482db0a0d74932d
font_01_sfnt_off00013c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15471 17304 bytes
SHA-256: 038ae8a31227cd2eca8341fae0c8462aed2b2453e8996211db78f53f2a697cf4

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