Malicious PDF — malware analysis report

Static analysis result for SHA-256 712694133cec8c76…

MALICIOUS

PDF

75.4 KB Created: 2021-08-16 04:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 85a67df671f9dacdb051c46a29a9f9bc SHA-1: cd6e5beb2607795646a625620cf059d5db5f849d SHA-256: 712694133cec8c76b9dc59b6388e85d3b92ab04c3f4714aac1ec7532fdcf48d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document structure suggests it's a link farm designed to leverage compromised sites for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd45baac98---13273131339.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0613d1d1b6c8ce7226484b3ded1f4f9e/viziru.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16106ec4996e0a---xovitoluvozotofejutota.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/64449187530.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/suxoxanane.pdfIn PDF document text
    • https://andhimazhai.com/images/files/tenopuwafege.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/nphffddr4ja7n6v5301bhq6cd1/kexupuvenedewax.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b083bda9e---modosipogirabebuz.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/92639352417.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/xilori.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/7gbfj8ibm4rg6uf16m6v0f14a1/kaguxafavofabe.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/lakewej.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/7vl4eu48rvohmk7spf02deotfn/67767969234.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff0dbfd87---xovasuko.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/84308874409.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/83530504464.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/82051995847.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/f155d534fa183721df00a6f2c50267a5/sexin.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2b6881eb---ludizofefunoxe.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f790a2237c5fb2cf3d0ed000ecdc46f0/3734146395.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93b9d154bb---5736192362.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/81805334124.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/9021444390.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/69390713300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cuantos+metros+en+una+cuerda+de+terrenoPDF 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_off0000c23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23A 10524 bytes
SHA-256: 96aa0c17d657a52de4a33bd147a3954b354ad8f7f643eaf6351bbd337349cdeb
font_01_sfnt_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 16924 bytes
SHA-256: 73ae83c3eacadc90ce3e70f7088d108ccbc0ad72c8cb37ca9fabc6e649caf4d7