Malicious PDF — malware analysis report

Static analysis result for SHA-256 2679f07fda772ecb…

MALICIOUS

PDF

76.9 KB Created: 2021-06-27 23:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 5d6d4af64313321d48be07567c60defe SHA-1: fde6c094a5fde9a0f73ad6a6f26e0252e06d1700 SHA-256: 2679f07fda772ecbfb39ccd3ba7ef0483bd63e483e0e890b4ceddfccf58640a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9063fc8623792528f90c6e8eb5ba9cc1/vupuneja.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3d8smgh5vduge423ush076fm31/66495992271.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cbiqpd37c3ahi2i60d82h6quf9/41463851282.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/zafibovifidipoxulugag.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0f4urmjrasccbf2kbdt0a917h5/21062002867.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f345b324---74272896184.pdfIn PDF document text
    • http://jinohair.com/upload/files/94643007925.pdfIn PDF document text
    • http://hydrem.ru/images/file/labuwojirebu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/662d7a71829b4111ec571be0bfd497ec/lusekejadujokusot.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c3c0f87bc71d32855508376089b6abea/woxevere.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/bapazeguxenixeleko.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/wolomugememobuda.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/36a4118ae32af21cae7715fdbac2bc00/46291960051.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/n73ga6mno0de4mh86839rhedrv/95372089585.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba27a52c2c4---jeresit.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6bd6cffe---mubuwatavowajama.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/weselopimetu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/237ff6e69d79a1e34b109236c7965583/jokos.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/90b20945b7e0e2478606b5d1b86f0e7d/74014365173.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/ithph511l043ah3e7b88lmghqi/60242322980.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/92128111950.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/68888221226.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e87b42df148f23f9971e7a4ca6639f0b/51855427132.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1835fdfa---vexuvadalofu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/96265337606.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/9050255315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=write+the+first+10+multiples+of+4+and+6+find+the+common+multiplesPDF 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_off0000c9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EC 15844 bytes
SHA-256: a1618300407e308883e8d855e1e64bc5b3befdd1ed7d64723ba5cb9985ebe7b3
font_01_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 11396 bytes
SHA-256: 8964411f7a71b4e6f48fd49a192ffe920a4a7e4d4719d1085ed06d51b657e3a2
font_02_sfnt_off00010d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1