Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70d1c921db51542…

MALICIOUS

PDF

75.7 KB Created: 2021-06-11 17:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74471c4e9ec169dffe992d85f1cafa0e SHA-1: a30a123f6afb3ba120dad188ee82fcdd2d4c8235 SHA-256: d70d1c921db515421e71c676d32262217b51bb9e50abdaaf8bca2e6553d61f97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or SEO poisoning attack. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=oedipus+the+king+theme+of+fate+and+free+will
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655ef213ad---fedutolaloteja.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/b6a23a198e4c9c49ec268bbe83c886ee/18954982027.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7a6om3jk6gifna86l80ufa2k12/lipalewoduguwiwobujojim.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/abjmukn77nk2uoh3r1ttmousqu/86461191436.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b27ed3c4882---matuvowun.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfd29177e9---dagixar.pdf
    • http://nfc.soo.jp/file/moxotuzifagejinasawe.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074969a21045---votaligakixilojidalovaw.pdf
    • http://2ds-creations.fr/userfiles/file/taxexadovubupe.pdf
    • https://emilline.dk/ckfinder/userfiles/files/72435408288.pdf
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/vewujopoke.pdf
    • http://peaceinsrilanka.lk/userfiles/file/67607114162.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9c530292---nurogi.pdf
    • http://rainbowcaterers.in/userfiles/file/dunixotukasazubisabubu.pdf
    • https://mmszke.hu/files/file/mimalojofotidaladasenexi.pdf
    • http://asfus.net/virgsurv/userfiles/file/xuzowez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cf.bin
143205a75c2ef18e85def49f0445b06c83b0997847b8a3f5a36c9d349394d66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 5640 bytes
font_01_sfnt_off0000fbe4.bin
fb83124b296c555d3ef3cbf5d6243b3622c18739cd7ed08b5a5fffe711c38fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 11120 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.