Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff88226c0abd338…

MALICIOUS

PDF

93.8 KB Created: 2021-08-08 10:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c57615c771bb11ba59f2c399c80be66 SHA-1: 3afb8c15561b3a1a4caa21e486f37ea5d45f52b1 SHA-256: 3ff88226c0abd3388468d7f1ca383122c5df04ee18e8040bc1c5af03ea4ed210
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://ketchas.ru/uplcv?utm_term=what+is+dangerous+goods+manifest PDF link annotation
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3e79b319e---rogir.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/69856373239.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dad0cbd3---98415069851.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/86363133554.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f8f1473a0bd0d39133293d9453e42b9/gebatowilo.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4ee0740b0a07aaa87df7a85d4c83e47b/66336325018.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/foxubunamadivoloza.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6efd7440f---82043052248.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d33d7b51f0a---98313939231.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021080103344445.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/17135516415.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b4c228f1c---kekiluresa.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b2762b91---fagexexofumagogow.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5bme1dri8t176kh469thfvr5o4/21166372572.pdfIn PDF document text
    • https://kawanmto.info/contents//files/wigokofalasopado.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7007ef66a---gasozusokekax.pdfIn PDF document text
    • https://magatek.com/documents/file/39490874194.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/folofipalotagevasu.pdfIn PDF document text
    • https://dptech.vn/uploads/files/4571218315.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/32680495378.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/m6v8u973rn63102cpej1oi4gtr/76186731783.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/52419831153.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_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 10848 bytes
SHA-256: 37910edb18c1131a88d2d0c07ff94b0508f7490db3970052f1c398bebcb091e8
font_01_sfnt_off000124ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FF 17256 bytes
SHA-256: 5937f70eff5c1780c25f8faf6cda4a3f74fbd1573bbea50e4e08dc1291e47399
font_02_sfnt_off00015246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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