Malicious PDF — malware analysis report

Static analysis result for SHA-256 8532f76d4626ecc8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 14:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e204604a57a239cd95ad15a39c5c5f9 SHA-1: 754eece1a9b485d676e333972459dfb509236189 SHA-256: 8532f76d4626ecc8ac769a6206960bb398342970ca9cdff897d83980fe41f920
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to drive traffic to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=convenances+sociales+pdf PDF link annotation
    • http://afro-safari.com/upload/files/kobodomebiwifasoxukof.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160850d9357ede---letodusufuvijite.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dfc74418c33d4e3e33962baaa4edc59/78070172950.pdfIn PDF document text
    • http://lyshiying.com/d/files/vadepoxiximijoxarelimim.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a81cc3a9013---64269034638.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a11418a437d---sovoze.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d687a5b00b---83222263384.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c71a79359---42925263945.pdfIn PDF document text
    • http://smakbyala.com/ckfinder/userfiles/files/dudafumi.pdfIn PDF document text
    • http://midel.me/userfiles/file/sosesudikowuluz.pdfIn PDF document text
    • http://hanifeugur.com/image/files/gexuxa.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/54533151905.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28eeab5b06---64470497189.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/bolavaparesidulonoxodeje.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5183a048---fijaligaj.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16105377613f7a---ganirasaz.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/gqu4gno2g3nqekr4ikea8kb584/rifumapazisevakor.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8osm1go3ibfqsl2916f72fbqtl/99079305514.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/xasiwepufobuxefevodisarot.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/18313884275.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/zevufuperijiwurumotiwu.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_off0000b033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 17340 bytes
SHA-256: 12f27a6bcc32c11d2753ac4501bb79595c35c3228646b708eda87ea9f9ff4bf4
font_02_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 10512 bytes
SHA-256: d6f3c3ddf0c8962e5acb2d826e5816184e7f6e4be250fcb78cc770d8edc62932

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