Malicious PDF — malware analysis report

Static analysis result for SHA-256 011bca785cb24e4b…

MALICIOUS

PDF

81.3 KB Created: 2021-08-19 12:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bdf322c17dd3c9ae7e00f823a5a74db3 SHA-1: cb40c1c9b337398a5d0bb4ed31a220366a28518d SHA-256: 011bca785cb24e4bae243ba77639576c4c5a176704341e8243cc3890e4018df0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=robbins+and+cotran+pathologic+basis+of+disease+10th+edition+citation PDF link annotation
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/987c95ad4ad080c6ccdf8bc7556b8734/lojaxekemotove.pdfIn PDF document text
    • http://fxlcd.com/upload/file/jirovos.pdfIn PDF document text
    • http://promador.pl/userfiles/file/47879563616.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/d48c43b76765ebc61389b5c9d39360e8/duxidiwemu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/oh0638antcauja49dlanb736e0/35854109004.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082c58ee62fc---rositugima.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/64601254798.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/33664049810.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/584d0c3d74a54f1519292c5672508c8b/89597496020.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/71121538976.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/83948648373.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/ludutiwukalov.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/91692178871.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607119a6330a4---sulujixigutojap.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/jltigjs1o0oetmrk7rvbmgk19e/58159612345.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/49170979114.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/65248703767.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/6pn6uvojg7oqj1loe30fu7ptlj/nubibagiriwina.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/69799626446.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/sosavuwodozowaveso.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f01392120f3e2983ea1b5d274a434b82/talizijenozetuzufipufi.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/lapedeminiluzegapadovi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0536c9d2---jirawexegoxanikoxezinofov.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/28228819628.pdfIn 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://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_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 11256 bytes
SHA-256: 2cd8e3a559e04ae27d3a35205170dd311d7737f11639230a21071d9fbd2f9a75
font_01_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 16928 bytes
SHA-256: 7a8340be79270233c9f7e4e321f8770a37ccbc33b1939d09ce67efdeaf97d1f5
font_02_sfnt_off00011e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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