Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b41e0f968c8895…

MALICIOUS

PDF

69.4 KB Created: 2021-09-09 05:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83a4f5de90f92d6bab599b54fb651a81 SHA-1: 4c56f8f66cded135d5055758664a088a001c999f SHA-256: 46b41e0f968c8895aa5fd478d8d9c13c7795cc054c9700f35121cad44ed6f783
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-only design and action triggers. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious sites or download further payloads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://teacherandtraining.com/coj_u/KK/userfiles/files/44971758757.pdf
    • http://aloisiquadri.it/userfiles/files/61207893098.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135743889d8f---wevuxedijalo.pdf
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/82389764604.pdf
    • http://jnnycc.org/userfiles/file/ritese.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/94492231784.pdf
    • http://agapetown.net/ckfinder/userfiles/files/74805392157.pdf
    • http://isleford.com/filespath/files/20210903230919.pdf
    • http://rotarycochinharbour.org/ci/userfiles/files/lomafij.pdf
    • http://tatagz.com/uploadfile/files/nukipamozogosiziga.pdf
    • https://hankilfood.com/userfiles/file/20210906092126.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134436fdedc2---jofokitatironowemozubo.pdf
    • https://xpress2.eu/ckfinder/userfiles/files/19694596406.pdf
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/mogagedivamiv.pdf
    • http://ilyxrace.com/userfiles/files/88563151383.pdf
    • http://tl-maskinfabrik.dk/userfiles/file/86631411262.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136fec0919c4---tubefiwinefimisajuw.pdf
    • http://bettynblue.com/upload/fck_img/20210904/file/wumekumewaxalesolipewuru.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612e9934cf5ac---81919175358.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613922af43b1a---52387203634.pdf
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/gonus.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa3492f84---zowosibasav.pdf
    • http://studiodispirito.it/userfiles/file/38441362399.pdf
    • https://ph789.com/pinhsuan/files/file/33815131713.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=first+mrna+codon+to+specify+amino+acid
    • 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_off0000b402.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB402 16792 bytes
font_01_sfnt_off0000cc19.bin
ea2d2c430a1cb6b86276c8b79c237a566517d7a5caefc3d18afe6c4fde8cd9c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC19 10824 bytes
font_02_sfnt_off0000e515.bin
52f79e5b8797ee384b19bead8acd6ff40abbf6a6d5372d7d7d90f8c851101a90
pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 13976 bytes