Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef9fe962e0fdfb9…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 18:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ba89a4d16b296a6cbd01c29913047d8 SHA-1: bc919fa6025bc25ba30687892a1a380c3c8c1781 SHA-256: 9ef9fe962e0fdfb92e0ce2fe1ef39dd1b7142b2a30cb7c812f74aa52e5a48975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's intended to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=manual+log+splitting+tools PDF link annotation
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/tljivv9v489k02gd5bacobjuq3/99734524747.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/0b28c1c6580ad90e4dc50c2d6a7142e9/28155181598.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zimozizuz.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/36705660160.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/1601259537.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/sutalozodawejabirodolu.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/vi1l15s98alvas4ffjtlgo3212/mekovirozovi.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/jipedoba.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc70d762db---rodamewugom.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff7051e7e---41070335260.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/kedururajinovujiju.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/5151775388.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079838cbdad2---57086299896.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/14797510669.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/tobugogojunu.pdfIn PDF document text
    • http://aurora-c.jp/files/files/vavarodekojapagixamit.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/refefosovepeje.pdfIn PDF document text
    • http://ruresept.ru/files/file/fapajaboniten.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9de4344c1a653294f79f2b52760f3393/matuwulalefu.pdfIn PDF document text
    • http://okvin.org/userfiles/file/nijijuwakosufavini.pdfIn PDF document text
    • http://rsentco.com/upload/file/22675039174.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/bewetuwilaruguzawagifoxax.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/34502229179.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608143227f079---kalilajorabeluwopik.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/3804i2elp1982o7pf0al33rgou/99686089275.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_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 10288 bytes
SHA-256: 7d2b4486b9a12860ab9dadd3f64c597d84245b85e458c42126cbc5fbd5fca983
font_01_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 17780 bytes
SHA-256: f1998bb252b38c7123ef0a55a24d2258332604797f12fa0ef066e402e548ebfa
font_02_sfnt_off00013928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1