Malicious PDF — malware analysis report

Static analysis result for SHA-256 6351d2dc85e07529…

MALICIOUS

PDF

92.8 KB Created: 2021-07-25 05:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 412678354dacb29932d58b06786888c5 SHA-1: 8edd9be69261ac99450c4026238bbec5c5bcea5c SHA-256: 6351d2dc85e07529def1a2ae33759bd2cb9447246daabc43bec62312e6eae9ed
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, characteristic of a link farm used to distribute phishing lures or malware. No scripts were extracted, but the structure suggests it's designed to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/99897637413fddb8a73b79a8043e2755/29921221409.pdf In PDF document text
    • http://sattamatkapatti.com/userfiles/file/26119385662.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4483c66f---15648831383.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/wasozup.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/97483994290.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/8co1g8rnjavufqp3mthho84vbm/pevebane.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/25329356915.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6c0b2d45364d847c4c31a38ced4e9b8b/80412611277.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/98388297406.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/xanaxaworizafe.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jifeserobogigogoroxasaja.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/t0pns7gj5ci7slgvm3iu96d2d2/37394433477.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/c4abn456acptah2242eqjrnf51/sakudi.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/50p4gr0bkijbsert69ot2am0ms/kafegak.pdfIn PDF document text
    • http://ibb-online.ru/f/file/vozozajem.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/95571234354.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/zaxit.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5deff934a2---ribemaw.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/17503259044.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85949920ee---48092000097.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/95f20dae0750548ea3b2987f1e3921af/12004420240.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/4815561174.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099bbaf1d3e1---fibemekubesixaguwet.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/dulan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=petrucci+genel+kimya+2+al%C4%B1%C5%9Ft%C4%B1rma+%C3%A7%C3%B6z%C3%BCmleri+pdfPDF 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_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 20044 bytes
SHA-256: d5895545e705d97a37ec89cff4fdf64f5f4c5458604792bbb3f360cc4a075c12
font_01_sfnt_off00012de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE2 12056 bytes
SHA-256: ef70a842771ee49cd767f64ddb753b24056d6e0856dca1b95dbfea6b8efc39b8
font_02_sfnt_off000149cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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