Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d52d44f709f32d0…

MALICIOUS

PDF

93.3 KB Created: 2021-09-22 13:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61f3a514e4f22d96195dd3d42e13ce5e SHA-1: 79936683d554b32c0ccd6c6a0d267ac50be7af68 SHA-256: 5d52d44f709f32d06101a48bc0aeeba70ef13a711d0c1660ff7a44851222eed2
216 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing a browser extension or plugin. This suggests an attempt to compromise the user's system or steal credentials, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/daa29164be25f53c1ccd752f33cf3426/dewerakimosi.pdf In PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/3301510812.pdfIn PDF document text
    • http://scro.ru/pic/file/leluwosadarenofopuxilusi.pdfIn PDF document text
    • http://cityfate.com/files/files/zorememidefotibubibi.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/xufadenevibonevepomela.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109201217306162.pdfIn PDF document text
    • http://chayka-svg.ru/files/vazubujolejukunu.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/biwebabam.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/70735078720.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/48949b930462af5765b6bc1af3b616c0/23134832657.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/97861722181.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9d2ee5a21c863249ff45d87e020eb613/86047855608.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161485c8e2b9de---77504513912.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/tusemorodobezex.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95938992715.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/gemogizidupezi.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/dokegud.pdfIn PDF document text
    • http://canvangdientu.com/images/file/bonolaligesakatukuvidedu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613255f0c1c8a---riwaxuzotofo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131156a1b377---40560025532.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/898520720.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/c9bl9qe715rs95uc93ruuju016/19180008768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+transfer+android+info+to+iphonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 10628 bytes
SHA-256: db1f7b7f42e85e3f54472cd080841f192d35c2ae1f9d35f5c5329bc872a885ca
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_04_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 24140 bytes
SHA-256: 53961898f2a5f697639973f2736460e97df7efdd4d7a77e9cf9b19ca8d650e38

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