Malicious PDF — malware analysis report

Static analysis result for SHA-256 8425d53bac68639a…

MALICIOUS

PDF

90.2 KB Created: 2021-08-14 12:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9671c530873b0f91a0dfa0a6677c0d7 SHA-1: 64bf47aa62afea30ef39aa29aec1fd74392e36ca SHA-256: 8425d53bac68639aa8ade36f52e0ef5de9818e4817a7a7451a97462246549de5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the presence of numerous external URIs and links pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the links and the PDF structure imply potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a499bc1c2a5---sirebimikodezevufogujok.pdf In PDF document text
    • http://hutergroup.de/userfiles/file/tufosan.pdfIn PDF document text
    • http://onelove.cz/file/numuditilazoza.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061614452073499.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/31356231802.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/60722620727.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/441dd05adfd23123f9a84893787a60b2/wegabas.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76fd1e1d5c---10247217597.pdfIn PDF document text
    • http://ttc-investco.com/img/files/18783780796.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b89aa8ea9d5---zutaxomufi.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b40f8d667a9f0f44177320cc07d5ab2c/jepoj.pdfIn PDF document text
    • http://cartopack.com/Images/file/64074497899.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/293dc3b488aef1e5c1a4493c59248560/gesekukojilekapu.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/figajoliso.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161085fc640f30---10656424019.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/gajupebefi.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210719202024.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/56236260565.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/3mneoab3slltm9dercgu159t40/87652709133.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c719c22e5a3d075b3b8a341132a3fc84/83118435711.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48a356c508---71379503915.pdfIn PDF document text
    • http://zerosquareonline.com/file/66724607061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hantek+6022be+manual+espa%C3%B1ol+pdfPDF 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_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 11404 bytes
SHA-256: 00c72721280607a426c7804c71d9ce24a399ff247813b7a753ca5c28f96eca02
font_01_sfnt_off00010f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 18964 bytes
SHA-256: 03a06fa3bed8acfd3bc1d05f5edb04c4d74b9b83f2982d535ec1159019e090d1
font_02_sfnt_off00014149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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