Malicious PDF — malware analysis report

Static analysis result for SHA-256 7348be54f72acd09…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 19:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c0822564b1b041fcb45e61e3f0c6020a SHA-1: 12633eb9baec8e27afbbb70534bf60d0a5a4745c SHA-256: 7348be54f72acd09526a085efefe42346310bccd6a5c48d497e4396fa304d3c3
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://ambvetesopo.eu/userfiles/files/budetutesitu.pdf In PDF document text
    • http://stopguepes72.fr/userfiles/file/pakedonajenigozi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2c904fb6---tiwomagexofanokokulobelez.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/botimafad.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/66225981566.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/lifejoseta.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/rapud.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/xijuregud.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/xowexifopidil.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/juraboxopofowewubitozip.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/99389766161.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16134410a2a05b---71286836278.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/55806446580.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/71297152096.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/fafoxodibokagaz.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/depesedomiriduxubuta.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/93681884664.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613270b0be8bf---gozuzif.pdfIn PDF document text
    • http://portableandcool.com/files/files/70245246831.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jemiwuz.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/tasomimaxivo.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210909_7ECB330A66DF80E2.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/sovokamomuloguremoxuwiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+tenet+moviePDF 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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 17792 bytes
SHA-256: 1abbc1f0a3edf4ca1c167c6d689fd268614af51078f8cebdc142f9bb552c2be2
font_01_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 10296 bytes
SHA-256: 9b18d742b8fb799636b78ae5aed0a25549f8e3199b4fb883dd7dd2ac2ad4f654

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