Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06bbb67a1528f9c…

MALICIOUS

PDF

88.4 KB Created: 2021-08-30 11:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ca76d20521da65369db78f6bc5f40f8 SHA-1: 61ad408fa6ee24de91961ec9450d818847913baa SHA-256: e06bbb67a1528f9cb8ae8f23e5772d2f1182f52c4593b13ee6be03e0b5bfe02f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and a lure, with specific rules flagging it as a phishing or malicious document. The embedded URLs point to various websites, some of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cructi.ru/uplcv?utm_term=agreement+form+sample PDF link annotation
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b179d33857de0a36e28243e6ea0939e7/vemik.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5a2e11878---puwozirunegowuneregozo.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aab8bd7e8e---kalivirixoginu.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/mosepivemixotibifumukidug.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/i8cu4um2taf421858kvtun4sof/tinutememajoxo.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jevonilasaf.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e7a014dda---bezikiturevezigiliwosene.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/lokitogabet.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/8b31550fde686861288b8334d29e8fc8/dafajapenivenixadonivote.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/jezuwoleliwunug.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/mafasixapevoz.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9t7e788rnflpkdljjal5sqqv98/19874956716.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210814_17E2B1EFDB33F70F.pdfIn PDF document text
    • http://digifast.cz/userfiles/19073675804.pdfIn PDF document text
    • https://marosme.ro/hirek/file/diparero.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/sazonaxariwododawi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ca27526eabd8aaab9c8b3158c49bce64/15825775658.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7083e42492c69502c81e8fa69cd5a911/pukukosibozozedikap.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/pogek.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/dibusikitisafijizat.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/jixixesobelozepunilijo.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_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 17416 bytes
SHA-256: 69942e822a85a0a1ad42c64b570049836eb21e54ea81ef7300a10a28839f53fa
font_01_sfnt_off0001231e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 10588 bytes
SHA-256: fcce98fac60b79210879dc8794b4852d38b3d372201ae3f4e300e0a5e481a659
font_02_sfnt_off00013b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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