Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d6784696db5182…

MALICIOUS

PDF

75.0 KB Created: 2021-08-02 11:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0cde28f408b3ae9f11a45ffb5148174b SHA-1: fb485a5e1e5afa63a444a8d6a666caca0a95292d SHA-256: 85d6784696db5182ffca3b34c3413b93eecc38cde6fe9a5caa6c747314002feb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=curso+b%C3%A1sico+de+astrologia+volume+3+pdf PDF link annotation
    • http://avs-market.ru/admin/ckfinder/userfiles/files/ruvuraviwigumutisetetapib.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/mofux.pdfIn PDF document text
    • http://epmachine.ru/d/files/pumazisexijoxarikelirolik.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/46219768511.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/1cccfff257e1471b1563e0c6e5f116e9/75563173776.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/bo0h6pdltmeqil53oqmr34s9b1/lifexog.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/jizepobejezezalagemupawi.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/30890734870.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/wewagasajoxubajaduton.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/womipedupolulax.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e049a0e11da00a99f548036b8ab768e7/wozewamu.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/kawaneb.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/cb9rankcjtp9fe02vfk3sh14kl/10969826649.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/desege.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/55108288580.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b012d728b54---66061340348.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160762e5fc2720---25547016092.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/72789404471.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c631196bb60---38994700013.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/kelusovosewapetite.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/06017e7c8a70b11a268f4296d2e14bdb/66424797700.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/68135492143.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/jilesoporuvodad.pdfIn PDF document text
    • http://fultoys.com/userfiles/gudibutivigon.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/bezoxamizi.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25d24496b---wonugezuwegenibuborituw.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_off0000bdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 11548 bytes
SHA-256: b863026ef83954b3443399c5b00a0d770df49fdedccef8c5775d0102f05a9835
font_02_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 17260 bytes
SHA-256: a1d83e6d81d18cbff897670ce8434fdda3ae231ecf1a7854a31ecbfb74813053

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