Malicious PDF — malware analysis report

Static analysis result for SHA-256 3788c1208e6ae4f7…

MALICIOUS

PDF

77.2 KB Created: 2021-08-16 10:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0bdddf333bf905338ddd6f409069cb8b SHA-1: 6db0ab45b2dfa47c7967a50a10d7c47fbe662b94 SHA-256: 3788c1208e6ae4f73a767475841222e0e8926ec456cdc80f4ed50a23f42bcdf5
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to lure users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly flagged it as malicious. The primary attack pattern involves directing users to potentially harmful websites via these embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://laborke.ru/uplcv?utm_term=download+free+tata+mcgraw+hill+objective+english+grammar+book+pdf PDF link annotation
    • https://lmbri.com/WYSIWYGImage/file/rozakirimexek.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad014e1b5e4---40216401154.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/dolumipijinuduwixovola.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/98710182275.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd2780164---vafalidugixe.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076620990302---bumevikuzomibeveburap.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/95052259010.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/43547063785.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/gapovabebozi.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/67239484779.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080c4da75809---36671213951.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/1769207050.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/pavor.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/18401731021.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb6d5e649f---7474783534.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/nizusutaxafafesifoweforat.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f86dc215---44148921087.pdfIn PDF document text
    • https://coluer.ir/documents/file/taxurarixibizaburum.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/18j1rfm584ppoiedfd0ilb92gj/xixefubojepel.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/39912508542.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/b4nqpm7r7ncqpkr2i2k89t9cn3/relufuwagizijiseluvoji.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_off0000c523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 11584 bytes
SHA-256: 9211cd328a89ba334bfbdc07653f3fd3335ba820d7bb8e5d4558db961de8a70f
font_02_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 17164 bytes
SHA-256: fb93fe452604d88b907a4e159e842aad46580205cc48ea277f09aba7f213ad5b

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