Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd26cab7342d9332…

MALICIOUS

PDF

87.9 KB Created: 2021-06-26 04:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eabbdeabb1ac5a29e72280dd23d79302 SHA-1: 0951230aa4da44d5a8d9d695aef1da12240068d6 SHA-256: dd26cab7342d9332a51eb4529eaa036a510e27fa894fcabd3d4b7981c446e901
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan payload delivery. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to obscure the ultimate destination and evade detection. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics strongly suggest the PDF is intended to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://catamma.ru/uplcv?utm_term=save+the+running+configuration+to+the+startup+configuration+file PDF link annotation
    • http://brightwayconsultancyservices.com/userfiles/file/79939604539.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/nivulogasiruwenibetaz.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082d952a06bb---82803573509.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/42643964479.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/m9mopotvb4cqtvk6fsjl03chnp/14444008191.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62d453e180---zowuderufolavisuduxogexel.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0414080c4bf8e723bfee224e758a512a/judilugemawuwisikobol.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/104712d44509aafcfdc1af6f98cc1eb5/76602618568.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/xalomuridumudexowefuzo.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/fivulejigali.pdfIn PDF document text
    • http://kasargod.net/uploads/file/27414456698.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/6194934260.pdfIn PDF document text
    • http://matras-devison.com/upload/file/49550794316.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b31476b78a---tipamiwukubibosizavesap.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/69024929426.pdfIn PDF document text
    • http://aimic.com/userfiles/file/lariworosubolosoxunala.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/76086291370.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c91882629cfcd7424b280b71d0c2ee9d/pofifurivasidat.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04abb63163---19236170195.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607171df7862f---mebebatigep.pdfIn PDF document text
    • http://modero.vn/upload/files/damovararepugusi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kgo6i3ku1esf7mrg2q76idt7h2/62339043250.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc31e216345---bizutuduxurafefoxixi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4337c42d7a5c19caa78a965a4a3afb99/bedidifufavujexabeno.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/92c87fcb0cbd62e8987b23e2618875a5/95422868850.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/11df087281ec72f46f681c1923a9ab2c/93539602649.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/6b574001f953da2a2f9b8ad444057653/294470022.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_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 17144 bytes
SHA-256: a49dd55c6e8ccb939a35f71ec689bc259609bf07794e34fa5ee6decbd48c9247
font_01_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 11000 bytes
SHA-256: ad55a76a0ccf329a9d950e57aa6476b9439e19f3054accb4d0aaccb24d9447a7
font_02_sfnt_off00013963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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