Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e907bfeaeeacfc…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 08:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 232d4f082e6a3e2518b9f44053db0587 SHA-1: f7ed0996f24ecd377fd8a297de7a103643af8a0f SHA-256: f9e907bfeaeeacfcb9b641c4eab8f6c2c930308084eeca21bf0b55819625ab15
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to websites hosted on compromised WordPress installations. The ML classifier strongly indicated maliciousness. The document's structure suggests it's designed to act as a link farm, potentially for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cocoal.com/uploads/file/99433823232.pdf In PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0c6cbb5e9217a5b3f8760994f36d5a7d/bovav.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9011789c98---44108558798.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d17a25cd0a287521c505cc338a229bbc/67248103247.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607af157d82c3---misususajagatubalujavara.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/08239d77b3546b81a1fcabf1f3a258ef/laxopelebeluxitafexum.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160721e1350a1d---zupanutabulelu.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/18968241323.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/tevizagefafibap.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/mamumusuximi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ff1c1be79---jularurofapila.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/4831994437.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867f5dc4017---jixux.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/76258240899.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/wilukunuge.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/56006760419.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/74823300726.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/kikutamixexililaru.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/28ff0c640b3099b89cb5c418578f498d/61806482356.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/dbe15e974d2c241e4c7792a336e8e61f/pasewawodepole.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc4dd60a3---94576130926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=absceso+pulmonar+en+pediatria+pdfPDF 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_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 11000 bytes
SHA-256: a03e730c47cc174a23d2e05d3b21e8b77e880f2474d40ad8a750e694c93adbc6
font_02_sfnt_off00010fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD3 18684 bytes
SHA-256: 0d1497d1ea5cd20f3760613ee85e2dbe11982f1fd87ed5f6a2c221fa2ef533a8

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