Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a178a29fdb81b49…

MALICIOUS

PDF

90.7 KB Created: 2021-08-11 15:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c243331af878eb3ffcaf8672ba94714b SHA-1: 9e895e01f924c753acd3a0d92e51ad10a168aeb9 SHA-256: 0a178a29fdb81b492953c8eef024145cb17a4ed871ce0f7809cd30f74c114367
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tortugafilms.ca/adminfiles/file/25904692893.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a95a90a9---9980043475.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/kr41ebbf4l6e89l43qhcvvfgjp/83884734169.pdf
    • http://sieuthibds.net/images/files/45338423037.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e00c73f4202b6d11e5ea7ba66e4b9a0d/gezun.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16108f4cee3320---riruvix.pdf
    • http://lyzebrno.cz/userfiles/file/nunod.pdf
    • http://vasvaripalmuzeum.hu/upload/file/62550293960.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c895e030a6---vosokogavufuwidun.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/892612b0515a5cbc5bca0936e516307e/68526895459.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/tiwitatedajodudezotuk.pdf
    • http://winso.tw/userfiles/file/86898352825.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b1b4ed6267511d6bf98ee91e45038038/50873089564.pdf
    • http://www.dawnrotaryclub.tw/UserFiles/files/64177261116.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d2ac52fc3---36499637790.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff1ae6c2e28---79692718021.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa03a7f636---70698886299.pdf
    • http://syuncyoku.jp/upload/file/wonabamozosevewe.pdf
    • https://cowichanseniors.ca/userfiles/file/52083389745.pdf
    • http://topinsolventa.ro/userfiles/file/kaposasuvanakuzulu.pdf
    • https://baongochoa.com/upload/file/mazudexanuvodebukowavig.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/gol2hfkvs02ddt70n1v3afsdg1/guxepop.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb605d085c0---18804896226.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c3a73fecd60a1a4139c5a21e07131ef/baborotu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=south+african+salary+slip+template
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea29.bin
87a3817e1922864ba9d03e0e6528a5a406a3402d3e757b712ae9b00d08b17230
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 16576 bytes
font_01_sfnt_off0001151c.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 16144 bytes
font_02_sfnt_off00012a9c.bin
e7418f4f60c06bdcf3734a623d4702514811e0563ff0141f6e4f112ec0eb17be
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9C 11032 bytes
font_03_sfnt_off00014424.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14424 16792 bytes