Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac22bd93e48c2451…

MALICIOUS

PDF

91.1 KB Created: 2021-08-04 23:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dc3b605cca153b6736e3132dc48e6351 SHA-1: 6d2f3d0649b035a7fb6833227f0e33f125a38204 SHA-256: ac22bd93e48c24519fafce138e8aa13802a590999d74c31bea86bf0e7629abea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://sheenabusesandcoaches.com/userfiles/file/pijofetafe.pdf In PDF document text
    • https://acgroupenterprise.com/userfiles/file/moxepek.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec43976f0d9---gajonanipepusipebabexud.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30d835c775---wafufiz.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5fcf89b92ac90ceb8190448204432c6d/zugulek.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/lebarokizifomipuzekabuwi.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160915f1428d3c---gulosakidozidorabudaduzeb.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/45288211474.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4d8bc30f1ca6c3b462946b8bb76f68af/misibonutadifanalas.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/2388b81aacb0c3b8b5602d8dd26fdfb8/kabokev.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/79678271872.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607402f05f099---dakobef.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd1c481520---13895141703.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e2f52fa58ceaf7b1e525826b7cd6df66/tizixelenejadinud.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/19360321331.pdfIn PDF document text
    • https://mszukam.pl/dat//file/xujimagegavonorixalawof.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/38f28038824960a7b917b42b94b43116/89863713460.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/ad589e375c53f7d98f7598b281e9c66b/bigafodud.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/49c73afd7a0e979218b4a9420d475880/5278106300.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/bijukudifojevuzimagujonu.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/resajekexe.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/rubezabegotagifobujev.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/92727557983.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/lofukusomipixanunadaz.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2a2391f6fc784ed46210744fd124565a/79899574689.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/dufubimijasibijosuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+is+true+about+an+atom+in+an+excited+state+select+all+that+applyPDF link annotation
    • 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_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 17408 bytes
SHA-256: e5834a2221ab16b62f603b44b6506a0ea04644198106fe93af241c4d73a76351
font_01_sfnt_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 11228 bytes
SHA-256: e212de533ef28417e629c0595e2e707d3f13974782fd5c18c395a48c6bd62c3a
font_02_sfnt_off00014561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1