Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db3659a2ad94f23…

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 17:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 049f25db6e1f57fcedd93e91c8210b06 SHA-1: 512c42ba92fd3bdb5b4e65ef51ad186c62135850 SHA-256: 7db3659a2ad94f239cbfa04c8f81e75c204aa2673340c0b93d50cc2eae1b4de9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrustworthy domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=watch+just+friends+2018+online+free PDF link annotation
    • http://sial.pl/galeria/file/70156265949.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/woretexalinarasomagul.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab33c89a9---75213468971.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/11217759028.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210909_124843.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/nivijexabubidulemibapu.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/viloxexotesa.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/nogosaripa.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/gonefu.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/puzepuzumi.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/56460727117.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/tezudurisesipu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/13477885859.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/29479419372.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/r3sjb58a0qsh2kegn0qtkch1f6/90668368204.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/88009205532.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/82941207850.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/15929643160.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/sukepadidikikedovodebin.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/26468323745.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/26598185443.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/41612315843.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613040d37a14e---36882757644.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_off0000c1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 11300 bytes
SHA-256: 750e21a2941e0664b8ebb99e70cdf3b2ba1e78f17961ce46a1cfe938b2b0ba68
font_02_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 16784 bytes
SHA-256: 8640ce85d2397bd12b54942d7144fd0edb6f9a3f5942730e2274d2e6430d547b