Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11b27031f339f63…

MALICIOUS

PDF

76.3 KB Created: 2021-09-03 03:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3fff9fa693efe233ede81e6918c9bbe SHA-1: b57d918d45696aa6cf8c2fb8b5e72ece5f2cce3d SHA-256: c11b27031f339f63b38c294ac0138f23bb729c4d275e732771701e1bc18fd9c8
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of multiple links on compromised CMS upload storage and disposable hosting suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c3dc8992b---25020568018.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096284ed9b08---14115905245.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/ghemfuj1gv3mvsicefnvvgmpem/zojonagogolowexige.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c784136465---poponivagi.pdf
    • http://madmojo.com/fckupload/file/kadamirorugifotewawofore.pdf
    • http://robalton.es/Albums/images/file///gofuxazozabewixib.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/rt858hkbnvheifsu0gujgp026r/rapujirogukepivugit.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/95511834703.pdf
    • http://www.niziointerior.pl/upload/file/97774247661.pdf
    • http://smepil.com/ckeditor/userfiles/files/gamopegivaxixizafari.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210709_C35B7A9A5DAAA63F.pdf
    • http://bestbuyfromindia.com/userfiles/file/jamibes.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/33276691972.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/7ba7b63b03e1c348359d934b4beb6506/nolezanunudene.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/mkvne8ks6afahnl9ojsvmu1f76/86720246725.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/a7k9qr41eob8557ppu8vrm2110/44673727074.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609424207b5cf---biridobedatu.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2bbb35645f58483f45c62f10e2be1561/44737967039.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/35640211013.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/niibaj21kvnv5r29uu241r6rbn/71621991061.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/569febb8e5a37ebaeb43981fa4571f31/61991937220.pdf
    • https://fetogram.ir/images/upload/files/xorakegorasozemisolol.pdf
    • https://mytekas.com/UserFiles/file/zurexovu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bm+sharma+pdf+free+download
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c625.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 16792 bytes
font_01_sfnt_off0000de37.bin
21fddcd38238f6c74952d998339bc4e038d4f047b73e8d4edb8532bd11976439
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 17328 bytes
font_02_sfnt_off00010b0b.bin
1afa35d11424fd917d53d0cc10f61e7d2e51aaef8cb165353c1af4bd2392d458
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 10712 bytes