Malicious PDF — malware analysis report

Static analysis result for SHA-256 892399b871e4c26b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 14:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f810393f0228a64da5c2fbdb1d4d66a5 SHA-1: e808c6c4a7489d93cfdee4c7fee3cb3252735a0a SHA-256: 892399b871e4c26be99d44ebd6b2f37ab449047844e3ac2b1e43759c9d2b9163
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://akvari-um.ru/userfiles/file/kotuxetaxavovorazuxibewit.pdf In PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/86389039177.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/10481377463.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/xowidofotebegas.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/lobasoduzesaxo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c5942dc7---99589617689.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/wimibetugenumegizineja.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/11570888033.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/41059542185.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/wufuvagizumokisewasibeja.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/nuvododujulajodepofu.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/gubomugeligabenuj.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/vowupizebaweganadesiv.pdfIn PDF document text
    • http://duef.ru/public/file/2117966035.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/waposisona.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613207001208f---zexoruxigutarajiv.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/sozukazesuwugipizoremat.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/95062883276.pdfIn PDF document text
    • http://kelsenator.com/userimages/gagudawomi.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/63520331492.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/rawanaxabep.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134162f644c2---43244721352.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182d9e52a3---xojutirelazizumam.pdfIn PDF document text
    • http://orderkai.com/uploads/files/24480377483.pdfIn PDF document text
    • http://hydrem.ru/images/file/fufusebixizejujera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=setting+usb+debugging+xiaomiPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD307 10864 bytes
SHA-256: 21e32e309a7786da8c39c43ef8b4639c9c698f69d77a7cec8ffa064f93e42fa7
font_01_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 18328 bytes
SHA-256: 6178fe98b26495445454eb59c7ad960ef8f79d24342447680a20d8b8c8c33676
font_02_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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