Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d55905ca6e74da…

MALICIOUS

PDF

89.1 KB Created: 2021-06-25 22:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0577f4b3e3a2cfb13c423a8aed71c219 SHA-1: 8c635ea573e32e6d110bc0cbbfe1a2c6785f9b50 SHA-256: c2d55905ca6e74dadb5edb538cafec8bd2eaad505ddecf4ad6cc806971ab7277
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting, likely to obscure the final destination. While no scripts were directly extracted, the nature of the PDF and its embedded links suggests it is designed to lure users into clicking through to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/92349628508.pdf
    • http://lynxitservices.com/ckfinder/userfiles/files/87833777118.pdf
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/89773766685.pdf
    • http://munnarinfo.in/userfiles/file/38160391250.pdf
    • http://www.lugashotel.com/data/editorfile/93826689887.pdf
    • https://bettyloupaints.com/userfiles/files/sixokasozuzogirerasenuje.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed8f85bd9a---mipataba.pdf
    • https://thuaphatlaihoanghuy.com/uploads/files/61750571966.pdf
    • http://accessiblevehicleservices.com/userfiles/file/jevexopoxutovo.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaa4eacc5c---48227536085.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765f58a11c7---59263777950.pdf
    • https://protradingindia.net/userfiles/file/xowavogaxaxuwarulota.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a9679aae0---xejuvesomolil.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964891a67a2---funafodelujifusiwovogenek.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/268d88a41926c6be097471540419e538/26838431341.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/farevobixufinipavib.pdf
    • https://yenhuy.vn/upload/files/74546561506.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7b9095c9e3ac920ca6a412262b72300d/loxitomelixuxumudof.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160719684d82f4---81808445555.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d094c2ebdcd75f75314a220d8e5fc6e2/basijixuperazizijorinikob.pdf
    • http://dges.in/userfiles/file/48693104045.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc27c74ff1---81855113319.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/tcbqjcjh1eva8bvg0edlpeht24/69166149565.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/sm5irfunl3a7rkit84g8jq1nn3/nofimepubowakinazavus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=right+chest+hurts
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609030604cd26---xazenuzibudero.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa91.bin
11e28c32e690afd77e234891056804bf2659eb0a29a4f8d24d2039413516cac2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 16824 bytes
font_01_sfnt_off0001268d.bin
eb405131c0d14c284d53882e9fb9f29a47ec09aac3dee7a4b2cae032dc1ab870
pdf-font-stream PDF embedded font (sfnt) at offset 0x1268D 10224 bytes
font_02_sfnt_off00013da5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA5 16792 bytes