Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4f7cbcc226685b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 06:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fca75d67b566e103c312523213b3a17 SHA-1: 2a2c875f17432b30a71965394575062d15f094f5 SHA-256: ce4f7cbcc226685b9cdce27d16a88c518cd4953c226eb6502182c4196ad574a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to domains flagged as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://giasidaily.com/uploads/userfiles/file/88572540054.pdf
    • https://dalyanestate.com/userfiles/file/26496971906.pdf
    • http://cokhixnktientien.com/Images_upload/files/18003370502.pdf
    • https://betenrealestate.com/sites/default/files/file/ziniges.pdf
    • http://cityfate.com/files/files/xikobiri.pdf
    • https://pasarangroup1.com/contents//files/49497172053.pdf
    • http://thetestmag.com/userfiles/files/juvavimofulevorewafu.pdf
    • http://www.pattyn360.com/upload/forum/files/jiwejulopeduman.pdf
    • https://flyingfish-stay.com/userfiles/file/juwabexaxeved.pdf
    • http://wasserentkalkung.at/ckfinder/userfiles/files/64218030525.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a397e4382---fanikakuwafobis.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e0698c76e99bcb3b525b7169d88b247f/10588767231.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/49dhrfb3lqujon6gkuq9mlks93/92660797635.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/toboleniz.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/7eb8e47336b355cdd06a8e817f7dcc24/80459401450.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fc54021a4---xodorivogusunipeb.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/f26lmg12ch2usltvj1roh96id2/42092596955.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e25de9e15265976f8cc44cfb01489b2/bemitugaxekojixu.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/gerutuvafuferibazovaf.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607507ad26287---15228440364.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae77d22b3---51358577071.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d4de668b089444a548d4150e875c5bc4/91446303379.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/aa81c575b606b9077071a3ab61f805fd/jixefejegutimugigilolu.pdf
    • http://caramelitos.sk/files/30906952354.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=rounding+two+digit+numbers+to+the+nearest+10+worksheet
    • 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_off0000dbc6.bin
50adea58f53779031ee4569b4a9386dccb3c59e47fdc41c01e44cfa1ac73b4e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 19000 bytes
font_01_sfnt_off00010d6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 16792 bytes
font_02_sfnt_off00012585.bin
404bc406f24474aa35423b7a517173f25ccfb0e36db0eb17faea2b24a6113564
pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 11284 bytes