Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ee95c649418f7a…

MALICIOUS

PDF

72.8 KB Created: 2021-09-10 05:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce9e647ee0fa12c3ac73da9de73e94ae SHA-1: acf782018f1664bfa633f5f0a862c97c50472552 SHA-256: 73ee95c649418f7a7c00fc8afd312a29d5fd130c0ec2a09d1c4af4d7e237a6b4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress sites and disposable hosting, and explicitly mentions a 'Password-protected archive handoff' lure. This suggests the PDF's primary purpose is to trick users into downloading a password-protected archive, which likely contains a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/35a8a80bb5e140274a2da306ecd543cd/52618130510.pdf In PDF document text
    • http://zuche0551.com/upload/file/danovu.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/vuxavafuloruvapoxafumudun.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/xagufuf.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/luxaluwojewawer.pdfIn PDF document text
    • https://epiphanych.com/images/file/kaxujulabixutimelazosibo.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/38905165964.pdfIn PDF document text
    • http://marketingnews.fr/images/file/17621896620.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/60936344198.pdfIn PDF document text
    • http://dogable.de/userfiles/file/76303165924.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/95859245910.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/94640647733.pdfIn PDF document text
    • http://starma.pl/files/file/32258762013.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/18775929534.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161374f454e479---pamiwof.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/2780549222.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/3952380383.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161350c7b187e1---87278947439.pdfIn PDF document text
    • https://tekartltd.com/upload/files/luzubirirewur.pdfIn PDF document text
    • https://upaspor.com/resimler/files/pukifagogadovuwuxawufuv.pdfIn PDF document text
    • http://trubaopt.ru/content/file/92354375871.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/benenegagosepulinezupiw.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/ruweju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+manager+for+android+apkPDF 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_off0000b947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB947 17196 bytes
SHA-256: 0ef2122d7e9872043726b6447610251edf687be45c2edcfdde4e3164a13c9b85
font_01_sfnt_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 10752 bytes
SHA-256: ca48193ddfd768b1d7236941a9f6ad48a309b6ae3ad46a6b14eb8f32bf771686

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