Malicious PDF — malware analysis report

Static analysis result for SHA-256 98aa3265c2d4f363…

MALICIOUS

PDF

71.0 KB Created: 2021-06-24 17:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1abda04ff37da9c5ae531e2c0b1a9f3a SHA-1: f347d6792346a7b4c2e41a620cbadb0bf55e3a7b SHA-256: 98aa3265c2d4f363dd3b2f6d9761a57b8323a484ba9a7122caa88c1329604eee
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content or phish for credentials. The document body, though heavily obfuscated, contains text related to downloading a "master key" for students, a common lure for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=master+key+10th+std+pdf+download PDF link annotation
    • https://imagebeaute.fr/userfiles/file/27788360182.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/21453876728.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e3a30c831---dopemoko.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/bumunoda.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/manimu.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/tinizebepuvuno.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/28716060816.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/64643719844.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/85380022372.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/sutonen.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5vbr5tajfpgi2b0b7figam4180/verufor.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/85b994c514e19677250d7075e56a6d07/47039872366.pdfIn PDF document text
    • http://armanetti.com/images/welidi.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/foviwawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 5584 bytes
SHA-256: 9846cf3f37a55c10effdd6b39525f340bc0cb85a98bed71a9258456c4feb5f91
font_01_sfnt_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 10292 bytes
SHA-256: 660b64f825e7087adaf9e0a58a448859c1d1cfded666e695cd8362fc1746ae1c

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