Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9af546d637d9bb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 09:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 460e734643a9c610b09ed423c82585fe SHA-1: 967782b61bfd120ceab648960e44e93b623aed9c SHA-256: cb9af546d637d9bb448ef6e175dd6af56d2455e6edc4df9a40f933a166cb991f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, and one directly to 'oniceh.ru' with a UTM term suggesting a lure. The PDF structure and link farm heuristics indicate a deliberate attempt to redirect users to potentially malicious content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://oniceh.ru/uplcv?utm_term=cummins+generator+installation+manual PDF link annotation
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806c0591b72---41889989286.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/95664006040.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/zisunovi.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/zopixodole.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160adc2baab51f---71062004740.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/saleporewetokolosakanizez.pdfIn PDF document text
    • https://jjpremiers.com/files/vifujunuvo.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/lidaretilepazix.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc9588f8c---mizudumivunabaxagejidopo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107fca3d2f87---97079222165.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160757a5717f3a---jiwexovejalerar.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/xijirojekixogebaxokut.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/tedivobivivizixaj.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//67400380052.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/kupapegabakoj.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6jesqhqdhv2kmcf007copghqj4/58271222360.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/rugixenufifoxatib.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bde149be9f9---gofarafajasizovumuf.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/69026185870.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6a5edf85c1303be7f6b591f9ee835dfc/41946077551.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072646a89512---8268327094.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/63900335020.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/hj63mvsdos2hlff2b75nif93q4/pisazexexeravazules.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/19838296946.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/78315012844.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/jixoputinopoj.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba96fc75227---mesagexoruvapegatejol.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_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 10580 bytes
SHA-256: 6845993791e2fcf87c4765ef70ea5143ba8c3378057dba52b6718cef20292fdd
font_01_sfnt_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 16796 bytes
SHA-256: d0720b8f289670586e93065eda7c5759086a7fdc62e38515f4e91d4f97423413
font_02_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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