Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf33155367ab66df…

MALICIOUS

PDF

81.2 KB Created: 2021-08-27 04:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7cdfe7fac7d9f0e9d72534b68b83f7a SHA-1: 6b7d02033b93b9602f8e2d963fbb9169fd25cfe6 SHA-256: cf33155367ab66df0c89a15f7ee130362ccd031d9c8f50bfc2781d27f25a0735
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm or hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mn-lawfirm.com/box/userfiles/file/48591748567.pdf In PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/87127765662.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/68259005003.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa8adbe2b7---basexasa.pdfIn PDF document text
    • https://signika.pl/Upload/file/10986267699.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/biluzifogefunelatopexita.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/43776128942.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/002b374d6db441f2f5be24ee7d583c96/47138973899.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/58327927794.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1002bc49fb752d46136a83ca91416d56/pogumezinurafemofilow.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607796bda76c3---7011405009.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/54413125264.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/wopokefeloriketadozenebe.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8090jqe4d2rlbot0g4r7uekno4/joralolebisumef.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/cbe67706ceece94465e0a7c7f7b82974/bolev.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/eii50gqovfbu6kfve5rfmv48nl/70884258252.pdfIn PDF document text
    • https://digireg.nu/upload/titawekejorodokilatozasu.pdfIn PDF document text
    • http://sakem.org/userfiles/files/39289456873.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79dece20c---92551350331.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0f997898c---zexubatulimot.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/duferakukak.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a557a8ee---biginebefewu.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/53388311322.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6f35ebb2dc36b6506c705fa6c41caeed/27396684779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=wow+classic+shaman+leveling+buildPDF link annotation
    • 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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 17096 bytes
SHA-256: a8630c67c5d46706d34078ae477204594072dbc50d88a3c604c1894e9f953a4f
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 11004 bytes
SHA-256: a4369644cb068a7c902104712ec899cd05a818c3e1a63dbdcae04240022ea477