Malicious PDF — malware analysis report

Static analysis result for SHA-256 efed1f6e3768c813…

MALICIOUS

PDF

113.5 KB Created: 2021-08-19 23:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9df6bb35f23db8e446f73ef1632f313e SHA-1: f862304cd2fe199a11b260b106ff627d109170c7 SHA-256: efed1f6e3768c8131d08d12ce4cc29fcd6ed2aa19edeb76f55d816326d9155d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The presence of a download button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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 https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160983d1a36947---tepurubabu.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16106fe45e56c9---dixuravedupobeso.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/lomavise.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/9190cb74a1020b002574dbbd1cdb7bb6/kuremuwugula.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/zerixusitoxon.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/98a7eae9625fa1e4bcb7afe0f45ebd15/93239028592.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/12204922955.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0vu49ikfi1qao3bi084fofp8am/delokubobakaxu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/nokorejel.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/ssv4js2v0f3cmnfv5n8kvokr0v/zovewofotosezawamawinad.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81d942c13---ravetoni.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/rsl3uqo75nv7urdjpv83va4lki/32078461011.pdfIn PDF document text
    • https://wecareprogram.org/images/file/zulewixagafoporeribasub.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c596c0639f---65756298059.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42dabd02b2---fufofa.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///79225966367.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/95802290668.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608442f283b18---62448852184.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/kazekakudobisixovaguxe.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9e7acfa66---25187340547.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6bc769e4---35133282560.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c67e4d6c30---kinuw.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zewexisuki.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/tarelinixijivawababufeluz.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609444432b487---30413749275.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e2869f68---99935145121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+do+dilution+problems+microbiologyPDF 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_off00015719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2B 17764 bytes
SHA-256: 1598d99ebbf26f03aa9e693010cc0b1d4350cc5e6b47711ee95bb5df9f2a47ec
font_02_sfnt_off00019d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D7C 11128 bytes
SHA-256: 3656bb753e6b9873a855acf4a163ec0b02868cf65f25b3e3af685f185d07f867

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