Malicious PDF — malware analysis report

Static analysis result for SHA-256 110ab46c7bcc6915…

MALICIOUS

PDF

91.4 KB Created: 2021-07-12 17:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d4ab9e04d730c6140116e870afadebf SHA-1: f305a0acf96ebee8a14815ac43ee500cc26e6997 SHA-256: 110ab46c7bcc69158815e6613d0da4304cf91bd73a52166c09bfcd762e2cf018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and points to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=reported+speech+said+told
    • https://pensiuneavalentina.ro/app/webroot/file/numuvarurobuwutezaru.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609697b0bf474---20052505803.pdf
    • https://digireg.ru/upload/72318344306.pdf
    • http://cpils.com/userfiles/file/15889753085.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7af6da453---nukumutufesidapilejagep.pdf
    • http://qzgj.cn/upload/file/nizisot.pdf
    • https://biomedchita.ru/imeg_master/file/9465860784.pdf
    • http://lapenya.cat/imgjovesnaves/file/gagolofuraj.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d513001cb4e443301d371f0f1871e10c/84396423406.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/agh5qufk50kfffobcck7p15rj8/57619348715.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3grmsg1hvo6tsrhmtaddaflq2d/78806199977.pdf
    • http://agapetown.net/ckfinder/userfiles/files/27410460643.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/bb5b58883fb55e96c5385f89bdcc7ceb/83986471001.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/kgtn684nla6arprkt45qjbm6e4/97430482475.pdf
    • https://daismene.it/file/19672228764.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/tisavano.pdf
    • http://charivne.info/images/file/nubofuk.pdf
    • https://snqrsl.quebec/upload/editor/file/lowuputogupewujanijunexeb.pdf
    • 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_off0001041e.bin
77870382cb4184ce5f6778655863921dd36e4a6d10b05a822813333ff67694e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 17180 bytes
font_01_sfnt_off000130b0.bin
3084f5b1a4395a082cfb8a3a2fd8b180eef8421f974b7d8629d809ac79bc90d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 10552 bytes
font_02_sfnt_off000148dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148DD 16792 bytes

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