Malicious PDF — malware analysis report

Static analysis result for SHA-256 446acdf519f92450…

MALICIOUS

PDF

72.6 KB Created: 2021-07-09 19:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3490dde4f114bbb3d6c176c3c55571a8 SHA-1: b7fd63728237ec449883d3ac2f82d6eeeef077d7 SHA-256: 446acdf519f9245002f1ddd45b83b545edaf0fdceaa77878f2800cd67f6e583c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--9w3b11kh5l.com/ckupload/files/boranikot.pdf
    • http://campfirewtx.org/userfiles/file/xukivigifagukubonipaj.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c613d9eec32c653d3a99a0767c2634de/puwotofusanesaw.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988440a409f---30813283071.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/88337ffd5409b1103eccf03c8c2fb9fe/85005792709.pdf
    • http://alnoorcity.com/userfiles/file/66289499758.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/36370251965.pdf
    • http://mesterek.net/tmp/58638420619.pdf
    • http://diamond6ranch.com/userfiles/file/zokobejojonejinoxodudet.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc45086ea7---darinuvukawurafatet.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b068409b10a14895d087bfa7328594dd/lokixozenewevanafawaza.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/q0bli52r18uiocu50lp666hud6/8099627607.pdf
    • http://menafundinfo.com/userfiles/file/tepitewezatogidasegib.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075799aceae1---79123002989.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3705acc9c138034876e68bddd43ac8f3/26080462412.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/13604c51902bab668eb8884088495268/11856587995.pdf
    • http://asbu.net/uploads/FCK_files/file/tunemamobitoxovufi.pdf
    • http://baaningdoi.com/file_media/file_image/file/pusipodaweguv.pdf
    • http://danchrisjewelry.com/userfiles/file/ruduwugajuf.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd85ac810---fusajuxagupo.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3af70c78---tukegorolibuwo.pdf
    • http://voxel-avocats.fr/uploads/file/sazedaguxexekijilun.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f522f748b8480c795c9badd860f639b8/kimurukifamamoke.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a25b5229126---81606514961.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=journal+of+applied+communication+research
    • 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_off0000b8f6.bin
f40f68af5fa6868cce61543e1b88aa553093caa0df6e52256a5933e84833ae3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F6 16428 bytes
font_01_sfnt_off0000e3b7.bin
6a3d55ddc5b70d0200dea2ddeb12e417cba71d691ec1c90fe85ac1324c162da5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 10976 bytes
font_02_sfnt_off0000fcf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 16792 bytes