Malicious PDF — malware analysis report

Static analysis result for SHA-256 de81987bebcbe292…

MALICIOUS

PDF

74.9 KB Created: 2021-07-01 15:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c27749ba4e4836bc6b51a31497a30d5 SHA-1: c70b0ec8987bb785076b21e6985b32e5bba0dea2 SHA-256: de81987bebcbe2925782ed69f64b59f05c7103f7c224aa4a5778b60ebb70c5c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=one+piece+stampede+full+movie+kissanime
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/fvjon09bdqh8rdv5ub86uqkl2s/508951252.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9aed7c305---xinuzajap.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fffa21175b---16889981633.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/50d65d4063d62cc37ec95823119ce94e/95798277660.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/68305318515.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3572c49912---falizikisagowikarobuxixev.pdf
    • http://alliance-ltd.com/userfiles/68287333529.pdf
    • http://amghanoi.com/images/ckeditor/files/17368007784.pdf
    • http://staceyasp.com/UserFiles/file/50070087272.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c868068a83d---3795291520.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54bbc3473f---82170658718.pdf
    • https://wita.lt/images/files/kataliduz.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/126f281743c0e8ec875f0b56684234f9/zunefulogu.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607088a33832a---judajorom.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/dofutefodeforaxisajib.pdf
    • https://atamergranit.com/userfiles/file/pakis.pdf
    • https://latework.cz/soubory/40580919991.pdf
    • http://asupuro.com/user_data/image//file/66116399541.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/35434fb1b34eb9b1ce8a48c0ef15a941/webigepesakowesivikejo.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9dcb3fe40---48734693576.pdf
    • http://ekolojikweb.net/upld/userfiles/file/sutalozodawejabirodolu.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d585bb357---12283015291.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160722f9e5b2fb---14707170791.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca47a042b---mavulagorewasose.pdf
    • https://anmimar.com/royal/userfiles/file/65403626314.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B2 16792 bytes
font_01_sfnt_off0000d9c4.bin
02ec129b56bd52abd3eba90550bb33c97c3d62f2890e9b6937d0d70ccc27b8ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C4 16456 bytes
font_02_sfnt_off00010471.bin
ce6ba75b5297a836c2d8ad8191b0433e30cbfad55ba92f3a1b25e58c2b869e0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 10964 bytes