Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3f742a64fcb259…

MALICIOUS

PDF

100.5 KB Created: 2021-07-06 11:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2929341feea88d6a4d9cd89d25ec43fb SHA-1: 2dcf6299ec3686e5d32363a51c4d3f2673d75f06 SHA-256: 6f3f742a64fcb25960fd052395bc8e1ee7fa5e1ced743d6437b1fd59d6bd7b02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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=a+acrostic+words PDF link annotation
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/lodl31a94e4002d2r7lhsihfi8/nirisudasoraxasazuzisulup.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9468baec85626034686b4b682ba1b8b7/35077146891.pdfIn PDF document text
    • https://anakmeong.com/contents//files/xebitimeke.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa0e077455---30435696461.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d44be1d233---motojatamamuguk.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/79549591883.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0cd2f054b82076ecc613729259e7befd/nolakogezi.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc23b2ae9---22825464947.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/10891133369.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/82093797811.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/95ogpmg87aa0ksu8ce7gamvvbu/10782691658.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/47acotglqic4um8mf4cn7ijlig/53551887140.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/33860871955.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/62967532270.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16084a35147515---winojexekurasepowezo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160907e2566a14---98729393764.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/6956cdad2abe69e55f6a466b877d5b9d/sefuran.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2457d21c0d8bd1c00b0660eacae2cbd1/xajebuto.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7fb9427fd86824fb8df7ca717024cc52/vaxizojupavomolagivafotop.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/fanofepevapaki.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/53204673384.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/48836871726.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/12412384475.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c46536ae323739762f9b0ad4dbb3643a/noraworivaguwevudo.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/56198180336.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 10148 bytes
SHA-256: fd606a90ca087fbedf02c5b71dfc0893b88fa2e7ee48a2404ecbe22d57c417b2
font_02_sfnt_off0001388b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388B 20120 bytes
SHA-256: 7294b961e7bc835fcc4c0be6616bb30e5a51cfd56aef70ed9e5b83a34061d8f3
font_03_sfnt_off00016c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C15 16952 bytes
SHA-256: 8cb8e5af7a8cf382b6ae184b977086ab5d9f880f98176b2c33df97b6f59c63a4

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