Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f726de692d96e3b…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 17:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33e51042e4ce5949273f9fa3dcf15ee0 SHA-1: c4908ad2df5728eef677373c3e52cdae08ffc2fe SHA-256: 9f726de692d96e3b7cc2888d5a151255e0c553ef70f102475385fb306acd813b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malicious content. The document body is heavily obfuscated and contains no readable text, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=peer+evaluation+examples
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074c64c5c6c5---gawawulivi.pdf
    • http://maility.pl_adresuserfiles/file/18494387545.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/34ee00143232d11819490574896c6102/40667985209.pdf
    • https://ludifrance.fr/userfiles/file/7469546443.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/cfculusrnvsqcce648hmmbu710/maleruwukex.pdf
    • https://topjobsnepal.com/ckfinder/userfiles/files/96740053635.pdf
    • http://riggi.ru/userfiles/file/nijimiwisovedodipatanudi.pdf
    • http://scamps.biz/userfiles/file/22627089605.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/l6ouqjaga7v3gb75tgurbb9lj1/15739880014.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a58221dfb8---35972089071.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b941364fc4c6f7e7a341f5191c3f7118/2317896083.pdf
    • http://impressivetravelvietnam.com/upload/files/gexarukasupuwexakopat.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/f92298e2d2548cb80612c19db2246ec3/11445015977.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/6uhgc16das7lg8njm58b9vh7mb/kerebova.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/cb1266df392e7f2839b2dd630c18f718/zozopomi.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2f6c0fd579e64accec28634c1c2e1c07/xofemetimitove.pdf
    • https://silga.ca/userfiles/file/pizazazagemavazeri.pdf
    • http://aihyang.com/userfiles/file/pobetajaleba.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b675d85adf9---79051243914.pdf
    • http://arci-mp.fr/admin/File/25784912402.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/d0ak883ncol8qshk1bltbosgv2/34391023099.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/355534b2653b359c4dee69875d6f1d9e/sexenudu.pdf
    • http://cioccolatogallucci.it/userfiles/file/60253780691.pdf
    • http://aexpress.lv/index/images/up/file/wavololajome.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 16792 bytes
font_01_sfnt_off00010513.bin
732f99933c01999e9043c0a656fcdb565f071a67581b2bf739e999eb96b988ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 10680 bytes
font_02_sfnt_off00011d8f.bin
cf5b6014c150353e472f0e59d34dcc8b0a26ced1a4775b416b512048b28c3664
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8F 17220 bytes