Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9afe08435c4d1b1…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 21:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3b15e16b71c044f6fbf7edf918152f9 SHA-1: 7e3c2f37c8243bc14bc35908247a172dd45bb867 SHA-256: c9afe08435c4d1b14a5833cef034169974460377f8d3dff1425e35506e64b2a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://queure.ru/uplcv?utm_term=6+bedroom+house+for+rent
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607181562add5---ludowir.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/63bdae2d0ac324659e91e9182f0c59f6/fekowofu.pdf
    • http://bjjiffy.com/upload/xitakowe.pdf
    • http://bortran.com/upload/image/file/20210611014457.pdf
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/8ef8bf6aef212fa7b837bfef86bd7a86/37556612726.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6c21b42fb---86778719067.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748e09aaffa---zojoroxoloki.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be6f5c381fc---wutugiwirexazovibofi.pdf
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/jubekamabapavedak.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/97aff4d1f6347cb9edf4e37bf5a5c926/70943733491.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f6e11f434bd7a5f42790e1240279fbd5/32757938056.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/aeccd1cf25927d9182de10d0069aa9f7/gofepolixupiv.pdf
    • https://actor-conseil.com/files/file/zoxuxuwupu.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/eida5k0n76bed7u5oe536nrpg4/kason.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb9225c894---91843579060.pdf
    • http://goneviaggi.com/themes/userfiles//files/84814659732.pdf
    • https://motacademy.it/file/44376292616.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/7issv25itppccutql7k2m5dq5m/wiregujafimekuf.pdf
    • http://colafranceschi.it/userfiles/files/50209473248.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb58defa94---modawogopesekejade.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/52908299193.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/bbea7e8596869ab40b3e550636741a57/91378032729.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/lemm3ri8chrm3do7u16tv7aogu/48141838940.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_off0000f0d6.bin
11e8da1387394c8f30c04fdcb924ba60113a53845ed6853baceb4bfe44d1bcd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 17072 bytes
font_01_sfnt_off00011d7a.bin
9f73456566af5de5a1ea70bbd03f65227db5131e5d863fa6c854a04ffacb37bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 10628 bytes
font_02_sfnt_off0001359a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1359A 16792 bytes

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