Malicious PDF — malware analysis report

Static analysis result for SHA-256 226a13a677bcc4e6…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 08:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 289bce380f7e34dc29590a79998c2721 SHA-1: b88822d6a9d9d542ed50d33f041e3ca8be5fd084 SHA-256: 226a13a677bcc4e6af88782da098788a39328cb35c484469c28648fe53a49c8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=tricotomia+en+el+parto+pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b49c8fa0---83215127203.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/32e788ac34bb922f6f20743e8c5eaf4a/84811610482.pdf
    • http://trevelci.ru/ckfinder/userfiles/files/26717137063.pdf
    • http://rhodeislandalpha.com/clients/56223/File/64480431940.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c6bab7824---mapodoxerividolitukob.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc597096f---48467868031.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/5cv5ajf38269vg1g4a19a1325s/rimunikinar.pdf
    • http://zuestag.ch/userfiles/files/susemozabevovutezotisuxaj.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/c5dsco3ffgsm43qadu6d01fbs9/digiwujazowoxubovusaz.pdf
    • http://xn--d1achljw0b.xn--p1ai/content/upload/zasobipamevape.pdf
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/38146622269.pdf
    • https://bandai-k.com/userfiles/file/muzajudibozalagatoneg.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7da6df90ad93644c0a26d9ee44d348fa/kewus.pdf
    • http://folientastaturen.pl/_data/file/gedalawagaju.pdf
    • http://glovimex.com/uploads/ckfinder/files/83236487338.pdf
    • http://icmasistemas.com/userfiles/files/kudawibofotetojulutamom.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81a081fa30---29369245950.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/dimimerid.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609414916fdd5---87846839843.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/78686804617.pdf
    • http://associatedreclaimed.com/userfiles/files/46225034787.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8be8a4c33---18560795726.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c97bfb18d9---xofiforotozefoneno.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_off0000e148.bin
d7565396d7f774bc3ca60339aa839f8f7062e644e6580c4c6a4e3d752bdd7070
pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 20112 bytes
font_01_sfnt_off00011473.bin
2e22b62396fef1580c3d7df5bcbcbfbcb1eca4ddca9fcb92d6c097c9dbaac916
pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 10576 bytes
font_02_sfnt_off00012c8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8A 16792 bytes