Malicious PDF — malware analysis report

Static analysis result for SHA-256 3798750fe7784c98…

MALICIOUS

PDF

91.7 KB Created: 2021-07-02 21:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c91cfcf3ca267a91b5f65593359c0024 SHA-1: c11a0e50e2aa4b25fc3750a3583917770b4867b3 SHA-256: 3798750fe7784c98b90b9e04d5f3598952561b1dd3eabc1b311e0c6c0f633acf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, designed to trick users into downloading a malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kiszelyugyvediiroda.hu/docs/file/mawidujizugigabubekelaf.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l7j31qm6lo5t10s2on1pvljh47/84534755593.pdf
    • http://go-pxl.com/uploads/files/39107496417.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083420419010---94881608417.pdf
    • https://adepotcustom.com/UploadFiles/file/20210510023303152.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1lr61e85sp84gopfg0p8jos90j/71295775374.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/26379877160.pdf
    • https://tanthuantelecom.com/upload/fck/file/76124937543.pdf
    • https://samavetpharm.com/userfiles/files/93413533183.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c80088b96f---zovusefepasus.pdf
    • http://amandamaitland.com/images/file/bewovumati.pdf
    • http://lumieretvie.com/userfiles/file/koviroxozimo.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/doxanitujarov.pdf
    • https://charterfori.ir/basefile/charterforiir/files/fulevedibafano.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/90158558493.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c712e8c63bd60a707e3dc302235c33da/82056358087.pdf
    • https://zop.bg/webroot/img/content/files/16327726924.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/0798a2fa92273b7332aed367f325b98f/xosonagefovakanu.pdf
    • http://creptiles.dk/userfiles/file/wekawaxekejan.pdf
    • http://blbr365.com/userfiles/file/1623322805.pdf
    • https://myclubowners.com/userfiles/files/32181701612.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=last+day+of+college+quotes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001063d.bin
ff6e69e84414fd12877373dbde6b1da271ced958a9061c05ebb5c780b9dfe263
pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 10672 bytes
font_01_sfnt_off00011e6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 16792 bytes
font_02_sfnt_off0001367d.bin
0db753d91c20f62f9922412bd40677047cce085c0debca72284cd0fe7cd5a969
pdf-font-stream PDF embedded font (sfnt) at offset 0x1367D 17276 bytes