Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9fa1345b8767d1…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 20:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fea66606e66c8ecbdfeba067d36ce345 SHA-1: c2eb05028dfad84a47be690ada9a986424e714c1 SHA-256: fc9fa1345b8767d1261f6407c3cee63f48d2b222d590181f2719e7cb6b985bda
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=dead+target+game+mod+apk PDF link annotation
    • http://tractortools.cz/ckfinder/userfiles/files/37329440250.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/99357962686.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/54e8ea40162ea6d7124eb69026abc1bd/kobarikovepiveganavegele.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/65709484594.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/4508389420.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/96471287387.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/kopanifobat.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/xorepakexiti.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/betaligege.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/96521287900.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/bugawifogurogeri.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/medabenapuligutigapuk.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc54d46149---76436908822.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/mitakelonepogas.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/14213920592.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/72825615366.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokinemuzigopawexobawu.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/risiniwevakasirereko.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/keleko.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/9240507363.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/10257056168.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b9b00a911---14336420079.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f554bff0a---baxugopute.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/farazinifuxovuzaj.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/95819439461347fe86dd5a.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/14098465997.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/032219579797.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_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 10416 bytes
SHA-256: ddd8a0165c4c35357cd5c2fc8d20ab7abfd58d0d2d77ee687818949d42b99b9b
font_01_sfnt_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 17248 bytes
SHA-256: 6f39087e35eb9d86d53bd0dd008b298cb04afb317a0ef0cb99375c38389d2f7a
font_02_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1