Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ac94b8ab4c649a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 03:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c149617fee6c04d5844e041caad14b5a SHA-1: adda120e455734fb913f2317ac508a8e24b09e6e SHA-256: f9ac94b8ab4c649afe2f38db10d75ca06b7e4571ff9401963d4f80a20ffbd6f9
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, as indicated by multiple heuristics related to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, while some are marked benign, are part of a larger scheme to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b9678494c12bdde06cc4bde22eb6138f/xorifilezatatulux.pdf In PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/54641335943.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/58883007657.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161199347b2828---6283452971.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/92d57b8b7a46915a926055dda3080bdc/9955287016.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/zorusovasutajimori.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/35021633771.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/vafivedak.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161185a87f2d3d---wotitugewutejaboz.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/19499255699.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e72f016ea9---sanetunimutinarubuwowoxuw.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/40226240582.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/53435339651.pdfIn PDF document text
    • http://jljemc.com/upload/files/69236259425.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/44854328757.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/74606041244.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/tixaxinitovojipujagapum.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/kepajezefapiwapalanen.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/nibosapokonaf.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/wakixal.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/bodudewexuzonat.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/gometurajis.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/62613962718.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/v3u0grovb83rk6qgkd5aeplap7/tesakeboz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=software+qa+manager+responsibilitiesPDF 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_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 11148 bytes
SHA-256: e9623373738f8ee32fee34cf93f69e58a57751e041578535974510922f34d857
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 16100 bytes
SHA-256: 158d2e6bddfa02c7fde005222149b3eeb33699260ecfe4cc0d623b432a560814
font_02_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1