Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0faad4023f3c727…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 09:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c4afd4432fed3dbf63c2543d15711521 SHA-1: 4d84b5695b1f5c4baca6ecc4d48721c4efe60596 SHA-256: b0faad4023f3c72740e2be8b8c7dd503061267d77b6a63e26310ef6c80640f1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=import+pics+from+android+to+pc PDF link annotation
    • http://custom-mugs-factory.com/uploadfile/files/wajusiduwikivaliwekaraz.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/6135576377.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/6156679980.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f623b1750e---gamuvezilomubererubogas.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/65724617548.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/bekawinurifujeke.pdfIn PDF document text
    • https://pokereshop.cz/data/file/24797210543.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/98649351236.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tudalumabitelawibesobopel.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/22694421268.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/vekad.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/5540144574.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/10574984306.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/42141123279.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed42d8b1c---nelebibusejuresexujotimi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5254caa7b668834499859fef6a35b207/sufamejub.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/vikajigenab.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/vilaxo.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/24641495869.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/zoxinefamuxezalamipowaget.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/71467298325.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/10023764731.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/cf39866d2adc1776d890f10d05124960/jugatonef.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_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 17464 bytes
SHA-256: 26e23decc3f78f236680a675c0316cb405dad6bfbb5ca6699dcb8122dfbf3947
font_01_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 10552 bytes
SHA-256: 9f7e439faf9c949319ea66d5ff8ec167fad923808f694e6426842496aeff9165