Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a68ad2570d48be…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 01:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9268558cbbafe673a729365cc2a791f4 SHA-1: 79c1c17de3ef7f6224cdd8cd0b3f1bc73631865b SHA-256: b6a68ad2570d48be226278cc6613500ae03e708b27d5dd9d911df91fd3b85344
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common tactic for credential theft or malware installation. The document contains numerous links to external sites, many of which are hosted on potentially compromised or disposable domains, suggesting a distribution network for malicious payloads. ClamAV detection and ML classification strongly indicate malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://queure.ru/uplcv?utm_term=screen+record+note+9 PDF link annotation
    • https://888nv.ru/userfiles/file/31114690959.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/pemimopamemupepenetab.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/raxonawubinefup.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/9167546988.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/wagegubilisog.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/bebevisuwiwi.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/68722368784.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70274e6f0---69680061203.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/84863873796.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/muwibebevetofeniw.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/50942641852.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/zoturenirupo.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/40016753646.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/zedulemutisivegomel.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/mutewasazisu.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/zidokoxumupa.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b8586a92---tagarug.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/dumabamotizixerudadoje.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/kigubenomatu.pdfIn PDF document text
    • https://everestart.com/images/stories/file/muzasibumakugodisorega.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130834625eb0---24738771926.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/58953036108.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/35607969455.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/85451835393.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/19337976334.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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 17444 bytes
SHA-256: c60f07223378a56d88ac1d1852262a9de6d0e2416ed8c25f485ce3b467b4d1e4
font_01_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 10136 bytes
SHA-256: ca948f7d532b370be642b9fe40b38925a75354bedf36ecbd040222ffe9e288b6

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