Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ae7890ffd94f51…

MALICIOUS

PDF

78.4 KB Created: 2021-08-09 01:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e702bb587efa0f075c75550b227eadda SHA-1: 439c870d0c102ca8b4afb66e8740472a65967a8d SHA-256: 86ae7890ffd94f5104a9fb3c9b3e2f9a0139dd430744ede9dbd229ab4ee66625
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised websites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=phrases+and+clauses+worksheets+for+grade+6+with+answers PDF link annotation
    • http://hagelkonzept.de/userfiles/file/gilapeboxuxirogogiz.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/semalamakunamu.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/es47fb3dhrs4se8f18tdi0n6t5/fanefusawaxisa.pdfIn PDF document text
    • http://lagrupacio.cat/file/tijogiwolumopaka.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d47508d470d8a3eaef543cea394097d4/48716211620.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/dc7e738ca5fbf0b7680f1a3eeaf3425c/48602389087.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f9f55c3e9---rugagime.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/82183896204.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/digibe.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/28943600982.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/marisababisifotifivox.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083abe837556---wolofobipigatudodi.pdfIn PDF document text
    • https://digireg.se/upload/81171184729.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/toxokitogefapidesinasusi.pdfIn PDF document text
    • https://loctra.net/userfiles/file/vevumujejejawulumipep.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083163d4eed4---jikitasowasigef.pdfIn PDF document text
    • http://contactconfiance.com/files/files/leraje.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/muxefajoz.pdfIn PDF document text
    • http://amdind.com/userfiles/file/60616113377.pdfIn PDF document text
    • http://landia-print.com/pdir/file/93302807634.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608587e12a144---pariju.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jazuwuxof.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ec9c7d72d---10298344769.pdfIn PDF document text
    • 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_off0000cc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC03 11200 bytes
SHA-256: 6575dc98be79ebdf8c243238da77a85b7cf575b86165f05142279a875c6f806a
font_01_sfnt_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 16320 bytes
SHA-256: 1204d8edc2e434030ebbfb6c31c29473d1a748773696f782c386cb1f671bd264
font_02_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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