Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c5bdfe7618cfb5…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 16:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31b94f284cbef05f425dd4778c10bba1 SHA-1: a955636511fe9484fcc992dd7f194470dded4655 SHA-256: c6c5bdfe7618cfb5be39b4ce68f193f09f953691847c992da5bc1783c8fd27b6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802ff255ed4---xogitotaji.pdf In PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/r0pi5iettm0m9pirnufnlphneq/zujim.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/moganuzuvabawonedezaguto.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/f2ce70827a318aba2c151ba711633ed5/14692464850.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/zilodopodubeni.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/128980b74c13c58208eab90c7056ec79/tugozarut.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/67447647271.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/rujenugona.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb4ed3a500---15273908547.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/tafuwaside.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/jisojete.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eccd2a61b---54815714214.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dea060a821---21010828918.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/gomonidekaridesore.pdfIn PDF document text
    • https://ienter.bg/files/38182960113.pdfIn PDF document text
    • https://redac.ch/upload/mepem.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/49469983456.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/29748555093.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/6753391483.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/26/file/20210626_140041_106.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/c34de3d44mfjrnf5ursq5ua799/sujur.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886c1706abf---96073691285.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/samanagizilor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kohls+black+friday+2018+pdf+downloadPDF 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_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 11412 bytes
SHA-256: 6d6c7dadec9ca1aafec992fa470dfc240d9663cf5213c92d8756eb70b2e87d14
font_01_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 18064 bytes
SHA-256: c080ddfb6eb23e9bd53389e0f39d53ce1a20c0cb571fb3a743dc7a86d6469e9a
font_02_sfnt_off00012d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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