Malicious PDF — malware analysis report

Static analysis result for SHA-256 479ba4fa98729691…

MALICIOUS

PDF

136.9 KB Created: 2021-08-07 03:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2938cf11a322a6fccf407bbf1e89c550 SHA-1: 931b271240102051cf1aff425af66ac4479deff7 SHA-256: 479ba4fa98729691f6cc44b6c5af0b560794157182e679f2e3186d4f20ad1a54
156 Risk Score

Malware Insights

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

This PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://svsteinfurth.de/radsportfiles/file/bonifulekitetur.pdf In PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f257dd6fa67f013a89742b27620a0070/75443400477.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/e732c56904dd9d5dcc0a7d99fc624661/jokonusazunuzagironeki.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/178a0fb94e3cbf05b58050283a589306/janigo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/xofode.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/68206145166.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/lebewunepuzesisunamum.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/8955b84401a00d50119253a8827a0001/bifulosusotozim.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/xefew.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/gamatavasat.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722330810bb---pogiborawitufodu.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/74387550550.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/ruviz.pdfIn PDF document text
    • https://airshow-bg.com/file/93414527123.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/d77f8f12d292d696eae62989223e0cf7/21614484563.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c872b2a5b73---jagejarojazajezorole.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/df4f6280ff6f7c275ca4b2b3f02f4eda/ruzopomeximiwisuxisagisof.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/52920510492.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160814834b26f7---56455477000.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/qt5hb0itks8tladqh72c0p8n81/29219475506.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d4d9facc30531634323ee696d0a6d1a1/vafarumegovobaso.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/davurewexijonunex.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/fca96c196b7987ac54a78db4999ae28c/buvek.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160872ec209c8b---fexezogijiva.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/8t9l4kkhh933nmaube6bb7pq2b/17551215532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+are+the+uses+of+lanthanides+and+actinidesPDF 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_off0001aa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA2D 10664 bytes
SHA-256: b296e978bd5fd881e3130b0d321a9c3e7c87767b321fdaf83fe2e96de01c51dc
font_01_sfnt_off0001c296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAA8 21832 bytes
SHA-256: f0750002b15f55dfc8cda22f2d774c51cf4a8eb557d521bd7734796296bbb37d