Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb93602d915a76c…

MALICIOUS

PDF

80.1 KB Created: 2021-08-15 11:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62758b994270385674ed2e08ef0ae6c5 SHA-1: 17409fb29434f05a63a2767af29b5b68e6187950 SHA-256: 6bb93602d915a76c92d27081aba36f96aaf801214e59b980b2b39112c8ecbb4f
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=libro+quimica+general+e+inorganica-biasioli+weitz+pdf PDF link annotation
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16078f37ec9418---zotobeduperurizuwa.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50ca7cc326---32474516897.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/12618691730.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cedba4700b5---35189548465.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/h1qgrhq3817ou7tau9i83n6pfl/serebubol.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/925e4bea22a29afa555b4bd3b37cd7ca/pivutujubuzuwinituzasiti.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/19280666e0e4ad6f8a1281c6552cafcd/1766249292.pdfIn PDF document text
    • http://airbaankhubon.com/userfiles/file/tamirajubidesizure.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087c5e2cf44b---nogovaponesebe.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611335b6eec98---62031996125.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/97227767676.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/pifamogajedokanoporunira.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e1e46a850---bamavuje.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/bivujijozetib.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3e8e18d522a5c845ff66b984f2572a1d/7672353653.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079be97563bc---63347127997.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8nh5q0jj3blmsetgmflq4rs076/jojusexisakawat.pdfIn PDF document text
    • https://fivetc.net/uploads/files/46450243518.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4hb99qian3q56nbverdikb8jsj/98617051504.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/tiloxadu.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/60973534589.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7704c24b4e---30583211565.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/rovelunewavijogagizan.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637340a8a1---41474706562.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_off0000d233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 11488 bytes
SHA-256: c1b6d059fa9a1341fe6ce675dcd4f4c1440bd392dfc61b556741a588516f070f
font_02_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 17160 bytes
SHA-256: 8e04f6788d83a3c77a1e233d44697c4f012a7d3fdd7e6004e01b03b932ff98d6

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