Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc8ab1255aae726…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 14:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1304c3b20dd8a5303a5cbe5c81c1c5ae SHA-1: e937435c856b626ab8d6e6d983d53411abfa8b93 SHA-256: 6dc8ab1255aae72674883ae40fc1d80d4ff40d3a8a9c4a6e557aaa7aa0aec172
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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 https://pistant.ru/uplcv?utm_term=sia+and+shia PDF link annotation
    • http://abwcrainhwy.com/uploads/files/90437590212.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/66511895309.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/teligomofefeji.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/pulevalatifudumofuso.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7fca2723---86667005579.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210909_395EBAC983F3DE3E.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3eb59f196---40833045288.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161424e7620624---10134251486.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/34176493359.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405fbddcb80---92202381685.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161424e93be18b---fekob.pdfIn PDF document text
    • http://njchemland.com/upload/files/pusoxinelari.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210909_142212.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/dozuzozefibapuzis.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/lumedidaz.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/98570962003.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/tutojowezimajatiw.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210923_3D58E80C0AB87949.pdfIn PDF document text
    • http://etnorom.hu/pictures/29094245561.pdfIn PDF document text
    • http://df-2.de/images/daten/file/wazojapewasawut.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/2157525756.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/33888286394.pdfIn PDF document text
    • https://slide-bearing.com/d/files/kamitewaneragaxojapudega.pdfIn PDF document text
    • https://aksusu.com/upload/files/rotovizamirusepamis.pdfIn PDF document text
    • 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_off0000b352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB352 9924 bytes
SHA-256: 014e555e1c908ef2aca7b11570f6ea2dffdf126eb0280f2a645295f19b117d1a
font_01_sfnt_off0000c907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 16952 bytes
SHA-256: ec6f278c20b90c67d8d4fb3c4d8f1159b825ba7f781d5909375996f2148575e8

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