Malicious PDF — malware analysis report

Static analysis result for SHA-256 a904395b35f6f2e9…

MALICIOUS

PDF

86.6 KB Created: 2021-08-07 21:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85fe5775452c48d8c609efa49802e603 SHA-1: aca76f78d58d4524391bc532a1ee42fa187a737d SHA-256: a904395b35f6f2e9926647af270624ccab0060d901b347fa56431f8e879c3117
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=how+to+convert+octal+to+binary+with+decimal+point PDF link annotation
    • https://cpsguffanti.it/uploads/file/dupoxusevuvu.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/41737771890.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/tilurilumalopane.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8772404a6ecf5602cce46a78e4fb7e7f/kazebuzililelekatutuv.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/buwewinoba.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dea15959c---55235435327.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac37acfec---wopuzukixabowoda.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mfgi026cs4hcfij8m1u0kp2bum/naratisariwiwiwezebak.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b8c99f58236b0923a57cdabaddade04b/nixekizoraboxuna.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///88951102360.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/gerobuzilejumonesobez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84b02b022---sijif.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/42553906398.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/widiguga.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089a685d1fa7---jubavasese.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/lanelepirupixazonibe.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070159e4e8c2---sofusegewigijibuxipipu.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/go1cd3i8k35hm689oclds7da4d/48069833098.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609167fe2923f---jezokubakipixitimu.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/99437382782.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098e80b08f5d---41620944657.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab475ec1d9---91337416632.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606da04021909---81749010576.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/dd84ca7175c6c61f2c1d5cfc15a4cdbf/4139837276.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_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 11008 bytes
SHA-256: ef1899745ea8bd744848ae7660c3d826734b4240c99c5509edd1cb1f113b1b6a
font_01_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 18140 bytes
SHA-256: 7db34ec1e8b761bed414b304607910206931e707cfa16f6bbb81f8f8131e3c92
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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