Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56d246067cfdbe0…

MALICIOUS

PDF

71.6 KB Created: 2021-09-28 01:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb60bfa4ff4a69e62cb15c09b996ab11 SHA-1: 54fddd73785516788fa8c3f6c4ea089f6597fe14 SHA-256: a56d246067cfdbe02c56fb99b566ffe27e4b5061c056391d8bd77aa8dd624b45
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://garglob.ru/uplcv?utm_term=can+you+see+who+has+been+looking+at+your+instagram PDF link annotation
    • http://otpetye.com/images/shared/file/pawekogupemux.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/33596555475.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/xomopubomafisolasev.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/cc6f2bf55d16179ad851712af86cd1df/69124899892.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5c329324---59343847690.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa75742171---nomususon.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/64966049320.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/mapafumogilivejoje.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/74146986079.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/torovo.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/jizevifetipamozokez.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142000dea935---runemoguvapow.pdfIn PDF document text
    • http://synergyproperty.com/images/files/54148557928.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/48647694674.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/somaboraru.pdfIn PDF document text
    • https://fivetc.net/uploads/files/98168848051.pdfIn PDF document text
    • http://bingsu.ir/cache/fck_files/file/wupijavizoda.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210912195638.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/74676636790.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/gusawotevubum.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140b079028a1---85199820189.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/wepuwu.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/mubirevomuwapolamu.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630448038.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/pimarepewewededi.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109080505231495.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_off0000b4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BE 16496 bytes
SHA-256: 33662f7780248b5b86a31e4fe4a274c123e49c4c88359424d0b20c1fe6148bb2
font_01_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 11120 bytes
SHA-256: 95d3088a829f6af3783e64b6a2badee96b68022467eb6f5055b56724ca4d3d26
font_02_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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