Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bf7f2ea9da5283…

MALICIOUS

PDF

90.2 KB Created: 2021-08-12 21:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2348e816690211d3e95aa7868c93a9ef SHA-1: 000fbd886d4383c633b0ca2ba00bd2346781aff2 SHA-256: a4bf7f2ea9da5283064757395d567d51124360d315e0151af9bcf27ff6ad6a11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a common tactic of disguising malicious links within seemingly legitimate documents. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://medvor.ru/uplcv?utm_term=como+transformar+3+arrobas+a+kilogramos PDF link annotation
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d288623f632ecf41a427039abb5e8cc/fedumi.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210710111102.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845fa9e1f65---jugezojonumuwamenusugudik.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/zoledofukuminuvixuxogopom.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a20d987c27---39983788547.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/5628668838.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/pajaremu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a924d45b622---linagutex.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/31156638931.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/dadazarelugame.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/516d6c59414da9c1cef5a977aaac8117/59699004235.pdfIn PDF document text
    • https://latework.cz/soubory/xemaribesavorokoripejudu.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/bodexezozigijaniv.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/57967054311.pdfIn PDF document text
    • https://nasikampung.info/contents//files/bogujepuxowegefetadoxalob.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/09619ca7dc8d3987bc73302dfc6fce9d/sidujapatepajavefig.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/309d16c3490e4d89c59366af635f2f4c/vaxigepesakidexexonufu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/51njmh5fcqaiarb5qds2nu0k93/76983803514.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/15355698496.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3328a550---xuvepesor.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/80922488627.pdfIn PDF document text
    • http://forti.in/userfiles/file/vefatusuga.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d8587e5b7817b469e5b8777401c09794/15362716137.pdfIn PDF document text
    • http://heizler.hu/files/file/nosug.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/43046626400.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 16988 bytes
SHA-256: 12429658fe04af9cd826c1d834c5b92a35dc1000c19e8dccba8ececa1663a480
font_01_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 18608 bytes
SHA-256: fb997f5d307176761256361c28a89ce2890e179a9517da0d8b334860a37c03f4
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 10860 bytes
SHA-256: b84b6c91becfa5229420624ea8c2d93bc03d6807025829f345f1f285c53fb391
font_03_sfnt_off00014087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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