Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f9f5f6ccc7b4fc…

MALICIOUS

PDF

88.4 KB Created: 2021-07-05 17:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd784b4276f619ccd7062b7d03e25e31 SHA-1: 7a3b56acc183c42f221ae005ba53c1f0cb9c471d SHA-256: d2f9f5f6ccc7b4fc805ea7e852006b90f7d48eb91d0bc7f4f6a9f37707c22363
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to phishing sites or download further malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=when%27s+the+new+moon PDF link annotation
    • http://spreewaldatelier.de/img/editor/file/leluwubidoz.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/87346790584.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/divav.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/givokebefiworutizad.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdb88a9224---janizufilewibena.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/daf6f599bf7178e2f6a8c1c32b8173f0/4717060439.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/tilorexalilufejak.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/45909613545.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160927fad0dc9b---nudovobibotore.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b3f5877f3---96910690882.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/lejukire.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/10140804454.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/893f97b09858e475bec7c74020262127/xenitenonoravaxijitisi.pdfIn PDF document text
    • https://cristalensi.com/public/File/43498112148.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/96085494300.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609410aa09c50---jibunimerivari.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/xemapodugunabafolikaxi.pdfIn PDF document text
    • http://dakmet.pl/upload/narifomimixuj.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1c46c3193a5b3a7ee139d950968a625b/nawaxezasozorujalow.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160940f969dfee---gotijedutapa.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a44c807b16---jevuvatopovezodi.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/lesesove.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_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 10088 bytes
SHA-256: d8e7a82fa54447ba798006cf9a0c221d377a5ef4664a9cb7253620409e689d3b
font_01_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B5 16912 bytes
SHA-256: 08cda96370a7310217174b85d7d5989aa952be42c994ddf73b77d01c689a5a3d