Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0663ba448548a6…

MALICIOUS

PDF

99.1 KB Created: 2021-06-25 12:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06ffd2b59659827344244e1b55b45e62 SHA-1: 080b3998c97b19aa222f866f877039add682df0b SHA-256: 7c0663ba448548a6fb9a66b1268603d0cd30867d35c8f081b34c22d3683bb0e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=roland+xv+88+manual
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/17614165585.pdf
    • http://seamacros.com/upload/file/rekuwefetadileziluxub.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a36aa8912ad---16399729537.pdf
    • https://dagvandearchitectuur.be/_files/file/notasosevaperedatanubu.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbad199b7f---vipajozalomobimol.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093d53b3b4da---nafipofalo.pdf
    • https://rumputhijau.com/contents//files/bizefofefefosezelolo.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2b1423373---dufemodorobojilisogox.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/27skh7gvqsqengq5k2a0230atj/zapokirem.pdf
    • http://artside.org/data/temp/file/58458359435.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978d667b8f2---26924534702.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/e32fe6826f57b7573a801a3310c926d6/17036511578.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32be58d47---22784338963.pdf
    • http://n-production.com/upload/fckeditor/file/pifuxidovukesikamusate.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b74c539ff---zubano.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 16792 bytes
font_01_sfnt_off00013729.bin
1754c7d3c508681a341c03ade8e58fcf55bf53d6f787390f47c0ee386f1126bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13729 19056 bytes
font_02_sfnt_off00016893.bin
cd168a865eee0f04a0728a47f0fea5c55892e7463d0dc629c7469ba7906ac342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16893 10340 bytes

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