Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f42ea577d9c923…

MALICIOUS

PDF

90.7 KB Created: 2021-08-11 00:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55623335d36017a272971d96e7adeff5 SHA-1: 2944903e40b0bea325278dfbe96d93f1dc79f36b SHA-256: 95f42ea577d9c923b46490c33d4b785f8b6c12b729725a1094fa24f57cbe368b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised CMS uploads suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=how+to+connect+ihip+headphones
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/e83d3276a205df13d88f60ed666b1d3d/gawalem.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/monokumam.pdf
    • http://millecolori.it/images/file/16781030254.pdf
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/14219841421.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a866e372acc---lepebike.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc37f0590---69869940717.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/8fd47d6749973d52bec8f0b56fc97cf9/54429465639.pdf
    • https://songhong-thudo.com/img/files/96772535229.pdf
    • https://ducthai.vn/userfiles/file/10159963913.pdf
    • http://webinside.pl/userfiles/file/xebaxo.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/852ad2d3a4e4c56f058cc04dc35e54f7/letadive.pdf
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/lavad.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e64504bf7b---regevurabi.pdf
    • http://bet-balance.com/userfiles/file/3023636258.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/noo2ili55ufq4rr8fs0jhsbcn1/13824623594.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78c587417---41535193449.pdf
    • https://stopserv.ru/files/file/ziniwitomituxi.pdf
    • http://caythuocdangian.net/images/files/45577871813.pdf
    • http://lotusburbank.com/uploads/files/24709093275.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d884ccd6ad---7636419546.pdf
    • https://resulgame.com/calisma2/files/uploads/96048599868.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e59b32048---lemikapagojapa.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f671e08f3f---rugiwupifewapux.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad900757487---24637550742.pdf
    • http://stavclearing.ru/upload/files/puvijafapujewoputatabuveg.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1dd.bin
c3c47b3540c280ac8874023c923851f88e9822c10bda994579d7983bd51b86c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 10540 bytes
font_01_sfnt_off000109db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 16792 bytes
font_02_sfnt_off000121e8.bin
266b75d8d95edd4e06796966e43e1bb0a7116b249193fb313f1988fa9bd38e89
pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 1696 bytes
font_03_sfnt_off000129f9.bin
a235c04b5437d7cfb65828a5dff5363cdf7d4b7bb35c1ba94ea4a35cac917ac3
pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 18340 bytes