Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2df6bf5533d418c…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 00:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a51d88103ec911fb1ca88c1eec074311 SHA-1: 1b7e52ff23a86dd84e02f2238d5548060d63f430 SHA-256: b2df6bf5533d418c96bc0e572ee67acdfdbad034b7ac262e934c2eb877edb76a
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document may attempt to execute commands, potentially to download and run further payloads from these URLs. The overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=auto+game+download+apk PDF link annotation
    • https://nezrenweb.com/calisma2/files/uploads/23111924903.pdfIn PDF document text
    • http://qdcmd.com/data/files/bevuw.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/37505781220.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/zewikeruvaf.pdfIn macro / runtime command snippet
    • https://whitesal.com/data/images/file/4292_20210927052601.pdfIn macro / runtime command snippet
    • https://speakingparrot.com/upload/ckfinder/files/sazerexomuxaniwosuxalu.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/julumupaleloju.pdfIn PDF document text
    • https://frisch.ro/files/file/domirufe.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/30693534014.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496415991d7---kixokezukigigavumuxivigin.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130671e61d2c---84986872990.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/tegupiteg.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/sutupi.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/34755526942.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/wejewuteva.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/35796911356.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/nabenoxupapejuzuxujaji.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/73190085396.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/9409586997.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/pinipizeso.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/f411a823d0f738ad862c4be850da4f44/tenatadaxisag.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/joluzizasulonepesorelixud.pdfIn PDF document text
    • http://serting.eu/userfiles/files/40559086488.pdfIn PDF document text
    • http://burbank.kopanramen.com/uIn macro / runtime command snippet
    • 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_off0000aeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB7 10636 bytes
SHA-256: 765e56bae0b3ec4d21c78149ea64bdff3664c9ec058fc7f23315e4b3b1aa5112
font_01_sfnt_off0000c6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 15216 bytes
SHA-256: 38e067468cabf8c5c80a2861b1a2d2395a3fb29339edb7007f5517ae17980bd0

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