Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b0942455a4966c…

MALICIOUS

PDF

89.0 KB Created: 2021-09-07 05:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9c3c33e45a9bceea5b0d3a9043506aad SHA-1: 99ac1641cf3f09800577f5ebeba47ea40cf1e319 SHA-256: 05b0942455a4966cc1ec85cd8c563cecf0adb98cfde14a87abfc268844295f74
164 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains embedded JavaScript and a link farm pointing to various disposable hosting sites, likely intended to redirect the user to download a second-stage payload. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://phuocthuan.vn/images/pic/file/6740303686.pdf In PDF document text
    • https://istanajp.net/contents/files/gutet.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad93b5388---lutikoj.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202108160124435216.pdfIn PDF document text
    • https://12tiga.com/contents//files/49282357100.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4b7f26c94---24149320195.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e3302f29b2d6b438d835c454d3d3e61e/89420258859.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a2b78ca49---remamagabogotirata.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd975747d3---93317738808.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/lomovoxonom.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/1gcqcis13ts08d85v0opgogg8u/16201958670.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/zowawiwunekitenaki.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/jodatejefukigar.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/39596023106.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/32662125771.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/45030892636.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/lakodewaligo.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a18d79f026d85350692bfbe955e6e66e/32487757161.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/segufileke.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/zuvedatijuvafirifor.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/dedetamoxowaka.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609bce710dfc1---zuxopowikepeg.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/nuxezewikumejadijavir.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/visovapad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=similarities+between+descriptive+and+inferential+statistics+pdfPDF 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_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 17916 bytes
SHA-256: 2dbe55d6c737915dfcfc6ce287917b3f2adddc252fcea8c833050998dc8a322e
font_01_sfnt_off00012468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7F 11028 bytes
SHA-256: e2a47866481d7e98d2677ba2ac48f42ea839f290e1053906f848ff5f46af2284

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