Malicious PDF — malware analysis report

Static analysis result for SHA-256 8933e11ed6c64245…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 12:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b330b662dd5233d14a5546e500bdf4d0 SHA-1: f3a265b380f948bc8c4a6f55a60376e010c9beb9 SHA-256: 8933e11ed6c64245718cbab31d4d32bb9155f8bf46b6308430820212a2c6d53c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://becucci.it/userfiles/files/kepolijerewodesopipomere.pdf In PDF document text
    • http://terezmisszio.eu/files/file/tuzuwidudevewobunijiponu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aded64f40d---kakerotaserexitu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/bukotadekobi.pdfIn PDF document text
    • http://chikatere.com/Upload/files/bimilinomuxidej.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6a78c386917f6e2e3b1404c69bf40bcf/ribituxapaja.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/91112782740.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/14717583263.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/93d4f1f78956e36954d51620a2c90c09/tukizikakupunogobokosirag.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/95097314752.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611948655426b---60441509626.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608599872cb3e---fametedavixasux.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ep3nob0hstg1ru35m07ivg29nl/renoseb.pdfIn PDF document text
    • https://tsegypt.com/file/14788155707.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/gavitazokunexefovo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a7cb1c02---18226975012.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/jonezona.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/55bfd290b2bc047a56b22bde97fc9dd6/44132783421.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/35606932931.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/kisukapunij.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/20485258278.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/dorisozawigipepazaz.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/kezef.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/dudibewuxuwonexatuvazuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=two+types+of+tomato+plantsPDF 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_off0000cee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 16372 bytes
SHA-256: 440965e5e0b3c6ccc1950b153702896b57db9dc7b6d38852f6168b3bfc1c4dcc
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 10488 bytes
SHA-256: 9dcefd26b6e7461575f1e45dc626c57a70f653af514856587e69943626e3fb9c
font_02_sfnt_off000110d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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