Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7629615ed93082c…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 11:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b2e44bd3bc970a69ee02f74f4c47bb9 SHA-1: 55696b369020951ee606f98564978a98ad6745eb SHA-256: f7629615ed93082ce97e38f20a4d9418dc5a55b4cf02618c7e3a4cb9e0aef6c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and contains no readable text, suggesting its primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://havanic.com/cache/fck_files/file/76213950827.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/16523092763.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/caf5517e1f76b5a5e44a5e3d83952fa7/sululinudeg.pdf
    • https://smilepaper.tw/archive/upload/files/tanad.pdf
    • https://istanajpdua.com/contents//files/19343220704.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af9655a370e---najefaz.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6006a0abf0119a311223f291d77ef0df/34967430712.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/bd104e347301a89fb0af7e815d815824/vevuvusaxiworikinegi.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/28278463278.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ea622d950---40289923288.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/cbf54971e488bd9ea05186fc9d35a1e3/54423229431.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3b5825aa2---1247571250.pdf
    • http://shqinze.net/admin/upimg/file///begemedoxof.pdf
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/21812304632.pdf
    • http://alexlunacoach.com/img/editor/file/jelodalatewixeminosug.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a423269a0---ripafu.pdf
    • http://easyreturn.store/userfiles/file/29497955555.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/44592412287.pdf
    • http://jnafarms.com/clients/864068/File/9361952730.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b32fe7b3eda---73168236012.pdf
    • http://jpind.pl/userfiles/file/bagasudi.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a03437a5bf9---84327535387.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+hack+carrom+disc+pool+striker
    • 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_off0000de42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 16792 bytes
font_01_sfnt_off0000f654.bin
a07ddff3ec7a76ff32647495451d043740a7a0835a3c5574da72e7e1368d935a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 17000 bytes
font_02_sfnt_off000122a9.bin
3e1d6d66b543d2ed9568bd729bea5ef18f70f3c0be103869f2f774b4e2825aa5
pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 10844 bytes
font_03_sfnt_off00013bc0.bin
88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC0 16340 bytes