Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf84e48fc0196c9…

MALICIOUS

PDF

93.4 KB Created: 2021-09-07 09:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c81b5d2228f16a16394284a8c3b33e98 SHA-1: 7ab4a6fdbb5efd3e1f465d1e051366ca9ef1cfda SHA-256: caf84e48fc0196c9ccd18f6f34c0be5b50e471872d87aea6b775633583c4c2c8
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users. The presence of a 'download button' lure further indicates a phishing or malware distribution attempt. While no scripts were explicitly extracted, the overall structure and heuristic firings strongly suggest it's designed to exploit users and download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://inwebjor.ru/uplcv?utm_term=curriculo+online+pdf+primeiro+emprego PDF link annotation
    • http://nedirajtebosnu.net/userfiles/file/5627083847.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/42580056855.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e36231e4e4---72595726330.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e0fcf58a---71611409180.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609de946b9b8c---90490349787.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91fa4744228983c7e88f3f4ebf9a41f6/gixosiruw.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/31140147872.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c72ee267771920752cd9e7a82f441ec0/sakirip.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/46198880172.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jisd0vam5vlejihb4oki4c5r8l/14163246674.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210614_DFC3D35DB11A9BC9.pdfIn PDF document text
    • http://landpas.pl/upload/file/birenejeg.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wulitilo.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/lafevunatakusipomipim.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/98b4fa9673a48ff716c90b12d0b3406d/53427887270.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/xumotanazelezozusa.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/98e1a9074616ed2cb8cfbfed49ce3ef8/wilurodesotirazidinewewej.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b51b4332e---karop.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/selotowubodekalukolagazu.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210821101413.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/25ej10qqmtdeq5s8ldmrdac3rm/berafonevu.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/34103875368.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/81h3iarpd52d0ouoivb67tsqb5/57497561212.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3f7e1969822de1ba803beb7464f1d7f0/kipizifopelarawu.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/e8500c64a33247b432f3ae8860a26122/72797129245.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/55050484751.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_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 18796 bytes
SHA-256: 45e45a694c67b8cc96fede1c9a7b78adda41a3460f789dbdb903460f3a52f7fe
font_01_sfnt_off00013859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15070 10668 bytes
SHA-256: f8a55778f551e3cee6bdf712abd21eea4b0de2b5b3cc17c36ef9389ae25ac8dd

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