Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f22d7191d7d45fd…

MALICIOUS

PDF

95.1 KB Created: 2021-08-02 05:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c0396a2edb74d7b3c0ff623f322b41a SHA-1: 0db21a42bf66a5a402d6aac68be7809168c134f6 SHA-256: 8f22d7191d7d45fd5bc23800a6b372f47240b5099fd9b63e8ce8094888fe8c04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089a974b96b8---sejesegewujule.pdf
    • http://zwickerfoto.hu/_user/file/65116345621.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f40ce4cca---muxamunapak.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c71c701be---majoxamopomugakipalu.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b1fa4232896074694d05435c88dac339/tagomapolizokelixariketuj.pdf
    • http://wahluenfty.com/userfiles/87625616369.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/88275038434.pdf
    • http://ih-consultant.com/ckfinder/userfiles/files/59175177969.pdf
    • http://robalton.es/Albums/images/file///15655813408.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfc1006610---nigiguxiwi.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd074dd17c6---65377397914.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091940672f8e---42916820613.pdf
    • http://vinczeandlaszlo.com/upload/tipefanemufusulubet.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bbc70141d---67625780254.pdf
    • http://hungthanhauto.com/luutru/files/wofosu.pdf
    • http://harasim.cz/uploaded/files/wazuravigafifizufanuveja.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/8ded991718e8e863dee528b45582f597/xigor.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b5eaf0ec3---wibuwemokewebemabuvi.pdf
    • http://asfus.net/virgsurv/userfiles/file/muzuteduz.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9fdb2a3ae---52925143136.pdf
    • https://aldurra.ly/images-editeur/img/file/zudapa.pdf
    • https://linardi.ru/files/file/pivikomu.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/93gro4nf1u280a81mu142simv5/kagijetegilitiritexinaz.pdf
    • https://chaletsuenodesol.de/files/56841667820.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/tt43uv0ft5goqa6dil7l2e6t1v/86122610072.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/10600361374.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+much+do+teacup+pomeranian+cost
    • 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_off00010fbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 16792 bytes
font_01_sfnt_off000127ce.bin
f9d8bf14900d4d90db8c5b8b5e803113b12d3982912bb0a4b75eaac874ef194c
pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 17052 bytes
font_02_sfnt_off0001543e.bin
3aa770c5f1d8e10a019e82f44871beabfbd33ff2f964dd1da418b969adac403c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1543E 10912 bytes