Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bffaa3a4a2028f6…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 13:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6a7a70a7f359914b410864346fe84b9d SHA-1: f77b1bfaff5ccf33fee2e51e99480c84f740cc49 SHA-256: 0bffaa3a4a2028f670d9f1e15590c28635e19663d63e06cb904eaff09eaf7825
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various domains, some of which are hosted on compromised WordPress sites. The presence of a 'Password-protected archive handoff' heuristic suggests the document may be designed to trick users into providing passwords or downloading password-protected archives, which likely contain malicious payloads. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://huntic.ru/uplcv?utm_term=how+to+clean+junk+files+from+phone PDF link annotation
    • http://master-vin.ru/files/file/7484404231.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/sezodujaxuforuk.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/jadiv.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146af2c4af92---33484872952.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/pivisunupimawafafo.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/11593703172.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8560b94fd---65800248313.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/xorinam.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/worufunululiguwotat.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/30284733210.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/telekhdj3j2d0d2p18a8kf2fvb/15037216907.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/44613850738.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/93119170933.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/pujokuworowiwu.pdfIn PDF document text
    • http://web5gstore.com/Files/files/27284163469.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/gisulujinasi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/d8u80crl8i07k89aq2712ki46m/jopofuxowegiwakokexodibev.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613db913dab07---lumiwawa.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/xevuzegirenafinat.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/vewuxubajujigidotit.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/zujexolepipumigowegariw.pdfIn PDF document text
    • http://benetalent.com/upload/files/bubasajepozajetud.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_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 19256 bytes
SHA-256: aeb0fbc4093ae6e963e0b145b36609ec8df355c85b161472166f6099b5cbcefb
font_01_sfnt_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 11144 bytes
SHA-256: 1a5381b1b38c077d0fc91afd70b07f1dcdaacc368344bb3d913e3e1da44fe6d1
font_02_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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