Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d309d2bf0d702f…

MALICIOUS

PDF

88.1 KB Created: 2021-07-18 15:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da75f4c03029c3bb2bc520479a691179 SHA-1: a745679a4faf464d5624bbd13cb009caedd84984 SHA-256: c5d309d2bf0d702f212f73172db35a99fa3a5fc6a03b473efb6e96cb0b71c59b
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories. This suggests the document is designed to lead users to malicious or compromised sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8e567096a818cbb1856448a9b8295b2/39619229515.pdf
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sikidamotitopajefuvura.pdf
    • http://adams-gold.ru/archive/image/file/zenopukuzasodurezij.pdf
    • http://aqbnb.com/uploadfile/file/13813989904.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/namr2ftf3ghhouhqa2hl6r699v/60018885480.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e04bf7b9---fodedakafonitek.pdf
    • http://valsadindustries.com/userfiles/file/ladovoxamosi.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/921a8db698e432c5bf7338026a53b8e0/sukogesux.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/7112abf4223b0320b59d8f0265b7e2ad/98833524601.pdf
    • http://polletnv.be/uploads/files/zisugarikebiterisiwor.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9edebc818d32f5e4b42a07f153b78d8f/kopijadebukexadif.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f25683ad787---96932510005.pdf
    • https://birudongker.com/contents//files/95017739659.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074414610095---68159376082.pdf
    • https://jagamimpi.info/contents//files/24262360519.pdf
    • http://flomojapan.com/upload/files/38095173798.pdf
    • http://fritz-fahrlaender.ch/download/nifubamiru.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/t5nc1u85v24i5419f1e22sm024/matepifinivekabajigumun.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/33490548790.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a350a4be4db---xunesazefitobigamiwovafu.pdf
    • http://www.moyekolodin.com/files/xilupudixeliw.pdf
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/gamiwinidunijazapor.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/lla9jaqpv5a9305hvd97s63v55/28894560482.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=j+action+words
    • 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_off0000f5b3.bin
7c4e658446113ffa2eba3185defb59f228f37f5278fbdb250f26a83c174301ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 17684 bytes
font_01_sfnt_off000123f1.bin
6c7e9caadf0e7df9b4b99a6cfdf9908bc1d67e85107aa9628056a9dec155ec56
pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 10260 bytes
font_02_sfnt_off00013b3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3E 16792 bytes