Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a1a21c182269a4…

MALICIOUS

PDF

71.1 KB Created: 2021-05-22 08:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c536313c1c576f2f2795abc88c6a203 SHA-1: 50bc733a08b9bca10380cbe9150eb6e8f47951cd SHA-256: c7a1a21c182269a4481fed8af6a8b687f67b94a864068648692461e560b9ddfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous links to external websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of invoice-related language further supports a phishing lure. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://allytemp.ru/uplcv?utm_term=centurion+d5+evo+manual+override
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/d5840474af7bd7a963b8c2b32d67b456/kaveviduganakajonikupaza.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d5c938456713861b926273b292b57f0f/94310032247.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/maliruludasibote.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/caec84df4410b9964eb28fd9282168cd/jududotimiz.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da8407e5b1---89382731443.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2b58c7e7---82023473283.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608390ef7fc27---vaxijo.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/5l83kkbrnte4e41vqltj3g49a3/20457257758.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098877dca483---dapavobibupugufomokutu.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac21678955---87092388099.pdf
    • http://wildpflanzen-planung.de/file/wiluvuzeredeve.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/43268975995.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4lvq948ih89asobs3m4i1ckalm/20774750307.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2425496c---jozixosipe.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9fb7500c47fcfde3b877d4929eaab169/94319134568.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ceb479a41---ganotobat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d001.bin
dd19899759bd846b1b4c2a3dc017642731e06f8654acb5c9a0547ee42bfa040e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 4884 bytes
font_01_sfnt_off0000e085.bin
33364e2eef7b6e2c97befa93ec1d37df4c427e6286e034250a5ff06d8b45867b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 2076 bytes
font_02_sfnt_off0000e985.bin
572d360a6e1b16bf3160b73dce0b53b11969c9a1d1ae844a13eb27f1ec2faefe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 11248 bytes