Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b8e465b12c63d2…

MALICIOUS

PDF

88.9 KB Created: 2021-09-03 21:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 569ac5b2698c94c35f0a322271de013d SHA-1: 073dedc1a5a6935ccd9f8df194fa1c18963779da SHA-256: 33b8e465b12c63d27044a58d55f887319781d997cfdba3be837af1bd7b258fdd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm used for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the link farm itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/aa9f5b3e5294eb5237e031443be4d9db/19244544181.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9120423be---58071721713.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/64836606367.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/89354341005.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/tpcb3v4bca3bh934qn430qo7b0/83806622195.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/zaxuza.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/pumetejimivosok.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/fdki3pb7nimp5rt1hhe8j7r26f/zukapapi.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/533d93dbee089f71cbbbe4bf9ddd318e/walas.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913056ed8a2---70939072049.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/mumet.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c362d1da9---raniwexufimomut.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4705603e34---mizizerogugipazigibuz.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/janaja.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/78a7415fab8466ed75cd33b63534c842/miseju.pdfIn PDF document text
    • http://candientushinko.com/images/file/95644640387.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/97713521538.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/dinafibepimavukinoputa.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b119a203a7a---51414601405.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/dg4aon07i1ko22fer813j24eik/gubixiloxafe.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/214305981f8d4645e243e60d055a5041/71831231892.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d82d93263e988d5481de75ea64500936/bakokowu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/91688783210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=vocabulary+practice+worksheetsPDF 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_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF2 18416 bytes
SHA-256: 4e74ea21e518307b8e8e639a47642ae9c45319dfd63c57ad65403489e35252eb
font_02_sfnt_off00013c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C96 10868 bytes
SHA-256: 9f532f8ba5c4225adadd8e026138b2eff0bd43cdf462985f01ed494f965f89ec

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