Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb9894f8d7a6559…

MALICIOUS

PDF

81.1 KB Created: 2021-08-18 13:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ce119d484b5af7c8f213afee5b32c86 SHA-1: b4a431402d3587a2a7cc7e16404549eb8ddd9a28 SHA-256: 6fb9894f8d7a6559100ccfe398db6430b23964e3adb398ac907f51524d23323a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that point to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of link farms and compromised CMS uploads suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=v380+pro+download+free PDF link annotation
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/1e7f8a880372fc998c561f3e4e57fe01/mitarigibituzud.pdfIn PDF document text
    • http://vizcsap.hu/files/file/pijip.pdfIn PDF document text
    • https://fallsplat.se/file/kiten.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/baxodutarujirovuvon.pdfIn PDF document text
    • https://trexanh.net/upload/files/76063034925.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/93279200943.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/xufugogikise.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb58c73f6a---8248459814.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/jagamapafowub.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/vorexataxakosojobufuwut.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/48737132312.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607127f5cc533---52361039779.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/veduvikubebirix.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/9a3c6d1e22e71e9e483c70003f4caa07/42300212334.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3ccefbc9---kamibukevopew.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/03ee687e04f2d0afb670eb71e4448da0/ziwoporubukum.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/9212a134f25b0e3afed23c3c58e50467/44277372233.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/dab96ad632d4c7fad1b694ff205470f5/tezuvadeb.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/72854684944.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/feliratodezijagego.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160db26566711a---32071187418.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9f63549405e2d58f9aaf92b94f05b1a5/zogugedasaf.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0f43576a90a80d8677aa0a0ce3b3d476/32664377687.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/54905127786.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_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 10692 bytes
SHA-256: 46fb0057a7170ce47f5cbde1dc10ec02d61058ba12d606cbf8af3acb0a2afafb
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 16388 bytes
SHA-256: 3a4c07ba806cc26de6ab47c2a253b5d70f2219f66fdff1c5eef8522c475b2fea
font_02_sfnt_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1