Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ae69bce75931cd…

MALICIOUS

PDF

80.8 KB Created: 2021-06-21 17:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2fdc3ab9a1cbaa9a98819cdc2b9a8853 SHA-1: ec2a24b02a0ad6eaa3a30a128ff0ff3f559d9fe7 SHA-256: 43ae69bce75931cd1f555d60445880db6aa2733e51fef9cf50151cb03dace07f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal appearing to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/2tdl427ttc1c3at8nsggu0rnd2/redaxujufon.pdf In PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/bogeduvorigegetofevewoj.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ntkch9940pqhop0vnh1fd5eieu/45811808235.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/zadumabin.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c35c2ec89ae---45879249224.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/10794577241.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae6087d6e---nedasu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b821e46efcdeef87061f82808c806298/98723098326.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/evikv6g2o3qg02us88su5qa2e5/fijumulozegosofexabi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/7b126433a39917880e058135e599a627/nuvujed.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a567999d3db---wixejatenaje.pdfIn PDF document text
    • https://banghenails.com/upload/file/95252179705.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4a3203ac---wagubamofozubilusibu.pdfIn PDF document text
    • http://alptw.com/images/files/tomifinalisefe.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/82c0fbb1cf6cae7408fbfe93a791b5dc/gavafexasivuvob.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c01f8266ee2---xomawapoxuxujoxevemokit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bhole+bhandari+dj+songPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC499 5352 bytes
SHA-256: 4839d0d7e82ae770f53ba33094eb62ff27fa9c16a3b95dadb0378fbfb9d3b9d1
font_01_sfnt_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 2400 bytes
SHA-256: 84e0d07ace45d8647b8307d07d422f2f5427f84fd240f1936483fcbc068a72ec
font_02_sfnt_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 12096 bytes
SHA-256: 21fb6a1789106f94e95bd1b90c473ef478511b8942424aa27aabf6736a1b933b
font_03_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 16168 bytes
SHA-256: 0216150ac0e5ade23b072752459620ec704bdac01526bfbadd96d51f96873ef3
font_04_sfnt_off00011ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA6 5904 bytes
SHA-256: e3e961cfb8ecd0eb3f6cda9b73adb26538f593a90726aa0c3c07d7c90f8a940e

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