Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad67c3a1b480d783…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 17:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66d5d38504f0b4b17c2ce396eeb3b55e SHA-1: c7eeffb14b63c1e29323b2c08c7d0d6a6ebbcf30 SHA-256: ad67c3a1b480d7831fc23d74aea5683fe40dd29d11098dd534534ff63a0b056f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to a variety of external URLs, many of which are hosted on compromised or disposable domains. The presence of external URI indicators and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=esim+for+android+phone PDF link annotation
    • http://crediramasrl.it/public/file/jefabifulasaw.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143701370ba7---24862617243.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/86281622950.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/bupobogadirotogugukezoko.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/30869216854.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/84499054833.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/24281304572.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/jifejijekugi.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/tugim.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/19498924880.pdfIn PDF document text
    • http://upakuika.com/img/file/17713163565.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/57571901724.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/vawawamurepejamusube.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161395243e425e---dapetirezumewosuvetezib.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/safego.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6fd70b19a---1137941550.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6fc608a0212d2cb2720e8d35bba8e447/rimugorepot.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/50718524132.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/gijigorevosogefeso.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/galikonufewixedopudawu.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/80023794213.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613895db044f3---81051236024.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/16348185185.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2e9d84e76bdcee5efa10f3ae74e40723/wometu.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/87121182497.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_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 10600 bytes
SHA-256: 905d86fc3e8b1c2998edcb494d9b4aa81b54b6f72cccd63613f642d78e08f1c6
font_02_sfnt_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 17832 bytes
SHA-256: 974a4fee1a70a2b9968e28d594363477620f6c54775e7681df6be64cc3394ac7

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