Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7407c8314a3db4c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 15:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 458e5f00743045bda599aac34522e2fb SHA-1: beadca7788bcd7ae4d2db73c6b84972e6b2d544a SHA-256: b7407c8314a3db4cfdfdc569dfd7ffc482e947e583b93f02b2882bd54d9cf8eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of distributing malicious content through deceptive links. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pistant.ru/uplcv?utm_term=messenger+gif+keyboard PDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161370b2f14986---43467476547.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/59234060365.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/153805653.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/50268150909.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/89184719503.pdfIn PDF document text
    • http://arucax.am/user_images/file/levuteropax.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/jidaxapojibaxo.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/tojubija.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/batigixomabuzasovimezadaw.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210903072609.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/zomawoberapesokizavigofe.pdfIn PDF document text
    • http://strandedtattoo.net/file/77131713412.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/loterinejexajoreduze.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/76167257951.pdfIn PDF document text
    • http://arablift.net/userfiles/file/tesexonituvogixuwi.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614cecb912b4a---50135376194.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/dusosarimexakom.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/jabujor.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/73401892218.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/28280506641.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614df708f1145---ginufobomugak.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/vepupimefekovubonezi.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/gutowisajelasuki.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/13207535550.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/25297398956.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j79fddk913ffue228fgp56e2l0/fozenez.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_off0000b219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2B 14496 bytes
SHA-256: 7ed782b5a111ed951ca8d7c6ad32158e2a52abf06430a0560ff344011ae710e6
font_02_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 10724 bytes
SHA-256: ce40a1b05f0299c5767d5c5861ab80c6dbad19cc96990a39a8492848e12b59a8

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