Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7db7215638baaba…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 22:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 079c1e371668462241e1f4c5f19ef84f SHA-1: f991473754b7d264c5e15f79475fbc48943275d7 SHA-256: b7db7215638baababb79245cf3e35e8587637dc0688f7f095a15ceb67c18283c
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=ganool+movies+download PDF link annotation
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/jisepirifokuzupaluxedevuk.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/vugubulibufelelakabetojak.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/36060097196.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/siwukipiguk.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/57958586684.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/38537381294.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/46236994736.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc29ee919---diwefuxurofu.pdfIn PDF document text
    • http://centronegozi.com/public/17468571593.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/pusarov.pdfIn PDF document text
    • http://risme.vn/files/ridubibikopijazozebej.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5db3a5062db997872bafd2046f9f971b/52950901361.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137cbe602857---wilewomizamem.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/15876814879.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/26737759918.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/84352141658.pdfIn PDF document text
    • https://whitesal.com/data/images/file/9026_20210901122737.pdfIn PDF document text
    • http://candientushinko.com/images/file/96987955689.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/24980574125.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/misuxumesorogomakuronin.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/99172374211.pdfIn PDF document text
    • http://355353.ru/userfiles/file/radubasapaluvin.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/76012416475.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/81565584465.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_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 10404 bytes
SHA-256: bfa3e09b012f60b121b7128110f26dd3e2e3b860fb73e53cf3fac1654fd4134c
font_02_sfnt_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 17820 bytes
SHA-256: 3acb03e211ef333920a9f14befbf6d05690d72ccf9bee2b7791dc6e34eba1506

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