Malicious PDF — malware analysis report

Static analysis result for SHA-256 744553e882d4036c…

MALICIOUS

PDF

97.0 KB Created: 2021-09-18 06:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9e40db2158cdba5e155098bdec1732a9 SHA-1: eab287725fc67502ea59d8784292c33ec4b8f53b SHA-256: 744553e882d4036c22b8a77797092a6a707f8ce884962639e401446b2c2508e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360065ce21d---94687183887.pdf In PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/5a219a7834bb39a4755674b827b35d3a/83172605631.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/93216381317.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59ad95cd7---fezababunodolalodijomat.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/moxiteziwuguj.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/xomemesigeme.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/57895991215.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/sag9u0se1r8t6nr28rlahtj1rf/71761682658.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/94100207673.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/tomakovetime.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/27415136895.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/jozasubela.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe717e7edf---6502565141.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/lolimebewabimuju.pdfIn PDF document text
    • https://palet-school.com/files/files/genijejugolit.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/36288023590.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/21207444400.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/mokekanipapapuzere.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/fakowejopagasa.pdfIn PDF document text
    • http://profstil.az/userfiles/file/74973067088.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/papova.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/fibegagivobiseteruk.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04b2c2b54---nugewejed.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/94726146636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=apple+skin+for+androidPDF 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_off000117aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC1 10464 bytes
SHA-256: 1baff8bc66b2646c4c74c99663ea42aaea412d178093e152e4e7194141c64320
font_02_sfnt_off0001479a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479A 18260 bytes
SHA-256: 47767a61125fc5d5e331ef8d39a319f7f7af218704146e04e4d60888eb2beda4

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