Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b01b3e168401b4…

MALICIOUS

PDF

98.9 KB Created: 2021-09-05 04:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 665790e6396ebbcccf9560167100ca3f SHA-1: fb4d5c3407f027c03aed39467ded15870af833bc SHA-256: d4b01b3e168401b442947ec169f678c809a40679ff32af83aa0d9ae1709cf031
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing or trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other potentially malicious content. The presence of many distinct hosts and the use of 'utm_term' parameters suggest an attempt to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=raritan+marine+elegance+manual PDF link annotation
    • https://ofertaromania.ro/ckfinder/userfiles/files/8323754980.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1c083a324f1ec1bd03777349f6837f84/84036785712.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da489bb3e---kuvagewobofetumapirur.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/76869336268.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780ed76f28c---labufufisolejez.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607768d149ef3---76092037798.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/26194891194.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/kizaxufogufafaremenagini.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/lasem.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16100a09427aca---73367930484.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbeca75744---rikozuvuvisatid.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091c8fe48094---fawadusizegetaxazezik.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607125efd5d9f---powowemakivod.pdfIn PDF document text
    • https://0900107678.com/upload/file/30163601252.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d795e4443c---wesulegofitewokokopidol.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/66240420924.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/37346145502.pdfIn PDF document text
    • http://vizcsap.hu/files/file/zabufanetewe.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210821105520.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ilu3e8itv86l9f6qm60ivble61/neluti.pdfIn PDF document text
    • http://axwelindia.com/uploads/23897853253.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_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13871 17800 bytes
SHA-256: 81e53354e940f835553ec7261cbf3f59f4740a327db8fc9018db314fb6baca02
font_02_sfnt_off000166be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BE 10432 bytes
SHA-256: 72ac8d9cb641a59fc2f5017d421c8204b6ffaf41ac88d49ab7bd4a0b001a6516

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