Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7f505168df7b22…

MALICIOUS

PDF

72.0 KB Created: 2021-05-07 08:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94b8d297f7f15da680160258ccd6c877 SHA-1: 9869c2e2f8e106728355c0d5522d24f771d60992 SHA-256: 8b7f505168df7b2242bc4b9b66a49d7457163cf55fc5bc8b27f6ec6042cab6fa
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607152bfed26d---tibeximedowemetupotix.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7f0ca30f8a2733e885c638cde263394b/54782660413.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d261a76966---13512762714.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2bacbc5d---berosepago.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/0af982737556b748576436bb52e03de3/39407894989.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737ef995807---21239238759.pdf
    • https://baoholaodong24.com/userfiles/file/femik.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607363d3cc361---teridiziboligidenebogoged.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160705a0430946---97456714234.pdf
    • http://alliusie.com/userfiles/file/baror.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874ed042aec---jadefumunija.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430211553262708.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072836529cd6---mowaw.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083888e42fd3---71184338614.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ud0jehh7h34a6om8jqngu49h9p/79178930059.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3ca9ed0a---balelonowogovovatog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=aldehydes+ketones+and+carboxylic+acids+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4bc.bin
a194c8306b13a3f707370be8a9b6a21450fb995abe40fa9da6d688628fab32ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 5272 bytes
font_01_sfnt_off0000e6ac.bin
50d00ca61c43ddad34017f65372f68ab6a1053762df28e0c1f30e4d088ac7852
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 10372 bytes
font_02_sfnt_off00010a02.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 4324 bytes