Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee924387365d83e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 21:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1069ab93f80dd77a6d9e26558e05507 SHA-1: 558d832b6bcc0233ee5bc57a64007891adcd608f SHA-256: cee924387365d83e41098c1d621fcf0549cb96512243028b6131bdd6b9c9190b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=webm+to+mp4+apk PDF link annotation
    • http://jacsonsfurniture.com/userfiles/file/vutefapixumosemod.pdfIn PDF document text
    • https://fasaac.org/temp/files/dezawegikolafat.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/45d432e22da97be5c521c699ebce4ec7/kavadasepavuzezapox.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/91588598499.pdfIn PDF document text
    • https://polandpools.com/contents/files/devoruwo.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/81831044075.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1fqijr66r1eb40s8p0baoni333/47918165254.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/wozeji.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/1196158305.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/84989200752.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/lofodewudisotamuzefuleguf.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/26091535742.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/kubakedifevevunobitibov.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/kumux.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/7943795050.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/91195400388.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a55f2d6ee---kalusorikixepori.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/91134523082.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/j9fauffjarmfag4h7al7massjd/76767135126.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/bonul.pdfIn PDF document text
    • http://lola168.com/uploadfiles/file/dutixidubo.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/turukis.pdfIn PDF document text
    • http://ruresept.ru/files/file/65173928651.pdfIn PDF document text
    • http://abnicum.ru/files/file/23471953527.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0e95f38e61a4f7e50ef357327e2137ab/19212106707.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/panifiwof.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_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 10208 bytes
SHA-256: 93af5e87edf328bde726b501d1786481dd31de7aa2ef0acd2110abb1ce1494ca
font_01_sfnt_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 17996 bytes
SHA-256: b2a1b59876614c23f6e0a944a473027ae425a7b419cd2098cc35c3543f8e8ea1
font_02_sfnt_off000118d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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