Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afac235504c2584…

MALICIOUS

PDF

88.2 KB Created: 2021-06-26 22:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ea275f68eab4d22dcbb67dbd2ee4797 SHA-1: 809da0f41929b211f2b65291ff0ef953314b7710 SHA-256: 6afac235504c25846b2d85a22e79822f3afba91527e33b15f981bdcb3122b46d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious activity, likely serving as a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://prime42.ru/userfiles/files/gaxetabozogisugifowa.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/71336686532.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c2c771adacae80755a39f6fea782c384/68914109302.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab17b58a6dc---69652714539.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3ff34a5a3---mavudijodogotekena.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3571bdf39b927d802c387521b923f3ec/30868418437.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fbp64q1o46bibkjd3ro0s9vnci/32653214179.pdf
    • http://www.tobywells.org/media/fckdir/file/viwubozilarazogadapivej.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f99672542---sunegofabigulabepul.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088e3a37221c---jedolazubarem.pdf
    • http://ithaca1962.com/clients/41687/File/13303949459.pdf
    • https://toolsatool.com/userfiles/files/95835961640.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/5a0ebljj13c4qf5kv2436l66gc/92787021144.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/digosulur.pdf
    • http://martonaroniskola.net/userfiles/file/71396535475.pdf
    • http://poltinik.ru/userfiles/file/40972730059.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072361fcc4b9---16090804460.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/1s26uatiobe168eu5fpgdb8qf6/3385012455.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa6b059126---fadilusip.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160888973abfff---wujutituwefun.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec00e9e57---diwenodupe.pdf
    • http://shuswapladystriders.ca/userfiles/file/90201557937.pdf
    • https://joebalogh.ro/imagini_ws/julubonolilev.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc869b6c61---budelawobazo.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/uv9acg5l7rs61mo9eob5k56aq0/taxavagoxizirazarobamofuz.pdf
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/pexuwakevejabanigetinuki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=classroom+interaction+between+teacher+and+students+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_off0000f032.bin
82a1798efe33d09756abcf27e29ebd57b71ab84bf958b929542d509b2e4c9af5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 11240 bytes
font_01_sfnt_off00010a31.bin
ebb1a061fb36bb04c4b4d6cf2d019176e86704b35bb1af811fe5a8384ceb4ddd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 18496 bytes
font_02_sfnt_off00013911.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13911 16792 bytes