Malicious PDF — malware analysis report

Static analysis result for SHA-256 182271dbc9a67954…

MALICIOUS

PDF

160.3 KB Created: 2021-09-01 11:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 878dd439dd979146f30c268d978eca22 SHA-1: 0b71a7b4674fe3858764db8cb4c4872ff0a0b449 SHA-256: 182271dbc9a679540f6279c291f02d1630ad42ff98cc18d4e315ef5de97a3e13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's designed to lead users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://chasehr.in/userfiles/file/50045767716.pdf In PDF document text
    • http://karpatskiles.ru/store/files/tuguxetipug.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c1998cb0b42aac5f54278d1ddee379a2/24801026588.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607054d433e17---14451096925.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/fomitolodaw.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087de3789f47---38118777875.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/48217409829.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/sokadagogorozo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a442d580d---zegirevijegilufenik.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a457b13d47a---nuxewozomofutanibojif.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/18111133385.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7226ae0850b20f497b3455f9b6f1253/zerusofejit.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/24713316585.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6f74a106---sunovewajikapapew.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5b91237215d69fda20633a8163cc81ce/tezagenukuzewemixi.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/34320844462.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2hr08k4akqqkslh162m71fn6n5/gogewedemutazetipu.pdfIn PDF document text
    • https://artenika.pl/fck/file/63741556211.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/34717781901.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/purosujonuzinesu.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/jowegidurifanudajek.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/dv6i3agkmtn6jadqjtbom7srte/9531391186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sing+once+again+with+me+our+strange+duetPDF 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_off00020c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002249c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2249C 20000 bytes
SHA-256: c97099fac631cb8020a68cc6de198176dfd5c2fb8064c58aae05939aee2b68b6
font_02_sfnt_off000258b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x258B4 11032 bytes
SHA-256: 856b21c19ca46ea4cb62096976a9634f166340c3b87256d586e890c962b2317d

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