Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55e65f328f238ed…

MALICIOUS

PDF

70.6 KB Created: 2021-09-02 17:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: dcfa1e63336c67a0da49a6eec0af2748 SHA-1: 2d1c685368a7f10ce91858227c92f08b966f49f4 SHA-256: b55e65f328f238ed486e6abf599895ac01b461117bc2e4b3018ec4bd24a86c8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary attack pattern observed is the use of a link farm to redirect users, potentially to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://teresachild.com/upload/files/junavekejanawabogu.pdf In PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/3969097286.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/xexivabinu.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/45962622238.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf083df70---78298736101.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/uuggfce3jmgum1qmokfqerhoh7/85960516012.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/52455644084.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/g44knf60350qi76m63is1apd7v/gituzuvotisaxu.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/52687368223.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/27401564361.pdfIn PDF document text
    • http://turnyras.lt/Files/file/ruzafuroneredux.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/jorepuwasobudeji.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/zozejusunabopanebisubiler.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/zowifabigerelojawaferake.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/xofelewasekamuwagurubozod.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607678fa40d48---48151355245.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608143910e551---32812015916.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3667563e84---jediwake.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/penejegeb.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/lubolireb.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/07u808k4v2meb8mbo1o1lrsim7/jawig.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zumidajeluva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=7+day+ketogenic+diet+plan+pdf+freePDF link annotation
    • 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_off0000b656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB656 10788 bytes
SHA-256: 2c931eb2d694f814501ab6223b86a6b6ae62d1edc6a433a8b7d70775ca2067ff
font_01_sfnt_off0000cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 14872 bytes
SHA-256: dd0e5fe1da202e2034b0e523d5ba063c96c7abe94b0d7e7bae842ff0a8763d04
font_02_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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