Malicious PDF — malware analysis report

Static analysis result for SHA-256 938a3efe4d03aa2d…

MALICIOUS

PDF

105.9 KB Created: 2021-09-21 06:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 731331a40c8e160837ec220179b4664a SHA-1: f3095304f17c8fa047a3a3301d66f20d345e6d91 SHA-256: 938a3efe4d03aa2dc5d507d69bb9eee2c7dd7baf636f6d3066f8273c7f523e90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=frozen+2+full+movie+in+english+hd PDF link annotation
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ulvvarr6tbi6s7ck7ouui0gmj1/zevezemaxinefujavikusekez.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/19120044250.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/xufufurun.pdfIn PDF document text
    • https://mauspro.net/upload/files/68127382202.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614430346cd40---fufaxuwujiresakolop.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/24813096735.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210907_3_52_14.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/junox.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/71456060938.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fce092ba54bb0ff2e126c92cb2893691/vupil.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143f2b8ce117---nosafotepupi.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/vasawobupad.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/lewem.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/kisimogesokegaloz.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109031525266066.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/lekexumixapu.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/17037782405.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/mosanolupozurajekugavufow.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b404954c9---tuzewusu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614502d65f807---lizan.pdfIn PDF document text
    • http://innotack.com/userfiles/file/dugolomevavewevagigibot.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/wavuxitodivedoj.pdfIn PDF document text
    • 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_off000133c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDA 20348 bytes
SHA-256: 7441cc7afe97fe7462895a14a95b04ec614b6ad4f379ddfbdb6044a4fb02922d
font_02_sfnt_off000180ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180EF 10864 bytes
SHA-256: 48db31a3e88f4177ac0f10014b9664b8e3f4a445360d7e54ff57f6e5df0292f8