Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4cf3764ffc11d6…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 04:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 354a23faeaf55ef9478f91acac4468b7 SHA-1: 17bdfde268c3e36316f4a8f9ddda4e3c036043f5 SHA-256: af4cf3764ffc11d6c41c4caaaf3cba68164db7c1c281e16e04483c5504c11712
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a tactic to redirect users to malicious sites. The primary attack pattern involves exploiting user trust through a malicious document, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160824817c185b---6017047983.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff1b7e6f3---55614370560.pdf
    • http://zimaletto.com/uploads/file/73932989580.pdf
    • http://bkht.vn/userfiles/file/zudelelugebalitipo.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/mrt55oebu3hbi414qb90pjarre/2841546401.pdf
    • http://dnepropress.net/files/file/61825255060.pdf
    • https://haysalon.com/public_html/userfiles/file/11847071325.pdf
    • https://annjulieskarpmo.com/userfiles/file/18867361461.pdf
    • http://habitat3.eu/userfiles/files/lixubagaduraladerawazo.pdf
    • http://www.tobywells.org/media/fckdir/file/dudonulilunixapatigufuj.pdf
    • http://nitexprofi.cz/userfiles/file/5219437901.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08808e408---26310503728.pdf
    • http://www.asap-recruitment.net/upload/file/29232279326.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be2862c4ab1---xifijegupiboxojararebuxox.pdf
    • http://a-kamen.com/userfiles/file/32649474746.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606eac2fdc38f---48320905107.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3fc4fab7a463ef592841a33556ad3bb5/40156490383.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607122323fffe---fuzegurutadenowoli.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aae15713c---39322885156.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/gut1sp44ncj2772nderodlgphn/tetatizisesuno.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27656ce405---rigeboxoxonaxunitexosotiz.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/6hpno8vrf436p0ddha2nok2t43/naseserofebov.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec73131b4d---70840453915.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dan+kennedy+how+to+make+millions+with+your+ideas+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_off0000f456.bin
f351d3a174039eaac247847ffcc179a0c1d2a9c957102cf0a8a914cd47d3f58f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 11156 bytes
font_01_sfnt_off00010e40.bin
b226bee5b0971aa1f505328caa5541cd8c7c224f201d79caa50050da4deae58e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E40 16672 bytes
font_02_sfnt_off0001393a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1393A 16792 bytes