Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee40c4358198d43…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 19:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9c3d79a5d8727097810adac6dfdb70b SHA-1: f244118c0c0848b41d5fc8238d454f401bbd66a1 SHA-256: 4ee40c4358198d43cd64ceb6a812e5d5ed4b372213387e8d1a7611eb495fc440
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aligokdemir.com/resimler/files/10568063788.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c763325866a7430b23539b4b363c0c65/lofanimuxavujol.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/tuwuva.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/43547063785.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611cebb3cf3b5---lisulubifoluv.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090ccf1b1aae---93536371873.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/75974376841.pdfIn PDF document text
    • https://castel.ro/userfiles/file/78568715998.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kezelafefovofejemapomawiw.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/xuwazufeginajemeze.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/j3kj8f3bagnjhbi6qrauh0lh89/barefidasupulepi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a7989463c---71729697060.pdfIn PDF document text
    • http://blueyee.com/upload/file/181047249385.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/79214589709.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/bubiresadovenina.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/39235308824.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/tufafizogifupazob.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/bowukunalemolesukorez.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ui55dn4n9dki93t9un8cdal0s1/vufuzoronokutemudugak.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/67918194257.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/e4431419c715997daa8f46557ad83505/gonuzuwikirupipojolilamur.pdfIn PDF document text
    • http://poorclarescork.ie/images/72640826497.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/84d332d1f26daaacbf75105e3004eaee/33849081621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=classification+of+aluminum+alloys+pdfPDF 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_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 10792 bytes
SHA-256: 3c1f36d72199cdbec849bd2665918e1bd5d8ee06ba4d1aebde309c8a6303c052
font_01_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 19836 bytes
SHA-256: 0486ae185f895cc9b08f368e6c16332480dc75bfc5b5cd6a245bbe1c69825a9e

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