Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbbb99232eb38fa…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 09:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ab1b0e7e51c3b4f4398db54fd7775af SHA-1: fc84b0009d4fa7a069fb84e6d1200ce7db8f8b38 SHA-256: efbbb99232eb38fac7fd487a6c3a9966f801f5267f8ddf4b7cc76ebde81400c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple link farms suggests an attempt to obscure the ultimate destination or to leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=troubleshooting+manual+aircraft PDF link annotation
    • http://the-bom.kr/upfile/files/87334952791.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161238d49b25b8---fotoj.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d63a32c34---1454251864.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/66555727151.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/59694405891.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f7806700b9eb7cb7365f82e5482216c5/marapebalezutu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db24ad76f---60068273729.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/kekelutotukadafajufoba.pdfIn PDF document text
    • http://samtekelektrik.com/files/rolejotiwewakikizixewasus.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/lotelegapajiporajebabepog.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/1d6153be184d7b7c19142d870b8e7451/81172318971.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3651a6d49f---nenizovaporon.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/gekozopif.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/51847854716.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084b6d7eef09---tasevosunojuvuxopomajab.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/tasativigoxiduvuvavasiwe.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/kuluxepubafu.pdfIn PDF document text
    • https://soechi.com/userfiles/file/pirozuzakezufugufoj.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cb1d49eb047ad7e7a9a8bb58a60effd/47950385349.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/pesitilokokal.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/xelamosajebevamijog.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874245ed4f9---dobesebetojefivif.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/59447309747.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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 18048 bytes
SHA-256: 0cc4d413487a01da186d5f5ddc979562e599cf63daae152000881f8bcebd1bf8
font_01_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 10984 bytes
SHA-256: 9a801502be637a8c7fd1b5b4ae24673edc183d9c75c35a48effbc97707eac896
font_02_sfnt_off00012662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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