Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dce8fdbc9c27a6d…

MALICIOUS

PDF

122.9 KB Created: 2021-06-29 05:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca8921e8d82edfa76e2cf077d0c35f84 SHA-1: e442c5597336057ea0a30a197ac39a504634c5ac SHA-256: 6dce8fdbc9c27a6ddcf25f2812b59be35ee75d4365759c26497d6488e5807b25
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as downloaders for further malicious payloads, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=pmd+to+pdf+file+converter
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/jt292u6pmndmf7i5isq563ujdp/51664815817.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7k2lvtflkm4bourj9mivpadqpi/1192754010.pdf
    • https://dalton-english.com/userfiles/file/kijewimedevoxidebulitixof.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609932be8c369---surunopigifob.pdf
    • https://fcksa.com/ckfinder/userfiles/files/tatop.pdf
    • https://auto-rujo.com/images-editor/file/vudamiwoside.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c2abccefb6b4a461410a1f724831bae8/likoxutuk.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1hdksqeangtfh6q8jnojihhn97/fibawokevenavuxed.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba77e4affc---sutefe.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609421f309d63---bizifonadoti.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ijiurkil0a5ujdg78h57m4op13/88540105021.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/79c888bb6c7b20f04af7a45878365d25/96158279819.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/7ffa207c90aa274e1fdc85551bfbc70e/vexataxadaxole.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b1d0340f---27494472624.pdf
    • http://drthchowdary.net/userfiles/file/mogew.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-31/20210531033145280018.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2549a36f4f---sadatelejotejodi.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2073dcc56---nobelutunasom.pdf
    • http://airfa.it/userfiles/file/82059515351.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/c60d0b721bec97c1fdd3710aba7e5076/xunumetarusetuxuzoxi.pdf
    • http://bafiti.com/sklep/userfiles/file/30563055954.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ae781014e---kudawo.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ca6237a4e24766527afba8af134f3436/xogexuzedojukodaj.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af84b66f20---gijeruf.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c4f1600e---50471276362.pdf
    • http://landia-print.com/pdir/file/tubaza.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cd.bin
5cde8219f6c7186ff4ed3954a0270740ad1b33bbcdb37eba9601c5941e27d1a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 10520 bytes
font_01_sfnt_off0000faaa.bin
25d6d42f02e8b539bec0dbeacc1d2bd9da225097411e4d11353b8b262c706fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 59320 bytes
font_02_sfnt_off000198ce.bin
09eb4e372519ff8a390693bab15b82af4b622902006d483242d5b41189d5d2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x198CE 16116 bytes
font_03_sfnt_off0001c2be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2BE 16792 bytes

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