Malicious PDF — malware analysis report

Static analysis result for SHA-256 7496fba6b443286a…

MALICIOUS

PDF

117.8 KB Created: 2021-08-17 06:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 404a1990ab4a5022c4b32108fa46d42e SHA-1: 4d567fc37609b139c2e6901ddf235aa39c3bde9b SHA-256: 7496fba6b443286adb708e6c18302aaeed0a62eb033c454ff1b8f1b7d3abd1e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the link farm indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ekstelekom.com/userfiles/file/gedowepuzudoxefuvomuve.pdf In PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b9a38982e435ad72d73ef8b0758125bf/xenenafakakajetozexaj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f564838990---kepigobemokox.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429032535969586.pdfIn PDF document text
    • http://atek-ent.com/upload/file/komofisozabul.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e8649b19---zazusepujiraf.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/17455963389.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/e817a8488d9829a761e535100bf0acd0/bakalegipisimojuwewewepig.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1df1be8bd5dc8222ed822c643c17f90e/gazum.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/nalojedunivevox.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/d929af06b944c498ed3326c439d15248/18037474858.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/86801842090.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a98204f7---litikubetalipaxowilek.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/lupatajabe.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/56656915619.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35128fff3---11991198673.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/saforivenanorifiv.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/vofafururajofereridis.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/62364156087.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/cvm584tjljophkm9fsup59le95/89372276492.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/tebukizugofomu.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/92776765661.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bfcb6389---fuduwasiwogot.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f52aeb969ab5a779233d0a993e8ddd22/jasemofupisasopak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fahrenheit+451+book+burn+to+readPDF 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_off000168ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168BA 19312 bytes
SHA-256: 266a66ba0ead6f2c11c7fb3c9c2cf1fbf766afbd9e6791084abb09e45395912b
font_01_sfnt_off00019718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19718 10704 bytes
SHA-256: cb13d71e8b48b66567ebf07757766f1f4b6617de67f74f3fb22e49e75a3e5fc0
font_02_sfnt_off0001afac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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