Malicious PDF — malware analysis report

Static analysis result for SHA-256 1443342d6a2df7b9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 12:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7a1c4f9baa86d5819a8536b06fe32b69 SHA-1: 236df88f3789c2a308f490629d71f3a8ebc653b5 SHA-256: 1443342d6a2df7b901b7ffb853c53bcc5fab4f3baabb5306944a7ba6bc68da10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating attempts to leverage search engine optimization on compromised infrastructure. While no scripts were explicitly extracted, the nature of the heuristics and the URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://thefencedocumentary.com/adminfiles/file/nuleto.pdf In PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/fipavizutasik.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/jexinamevideroxu.pdfIn PDF document text
    • http://hanifeugur.com/image/files/xaduri.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/41089363011.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f96488dfd---31524421165.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/fasifatosololut.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/776221578.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/13412414121.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/87839638787.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/borubuzixokidiwasudopufo.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/gurivawerobuluwez.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/47496871811.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/3747347366.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/86786578454.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/18572958832.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210915_C3E5C6EEBAD10BC6.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/posuninoxovowa.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/93403239674.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2965dc9be754c4e7d5309c9e5a924f0d/40170336110.pdfIn PDF document text
    • https://irrisyst.eu/files/file/68966897465.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/1913206624.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d26aafd52---ziwoxeduxafe.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/86981043072.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/43352620499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=steam+gift+card+key+generatorPDF 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_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 18164 bytes
SHA-256: 3fd126f83d47d3232698332fb37d39ac6f7a3d85ee3b6549d981de060e18a502
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 10884 bytes
SHA-256: 50238849357bb508a70070ae73a6e1b64f66ae5d197d424afad78c3899e2f671

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