Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b64184b2cf2e7e…

MALICIOUS

PDF

96.0 KB Created: 2021-07-22 23:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8424bcae4e232e054af9d1d0b82767ed SHA-1: 238d55f91e3cd345ae51a6170374a6ed62602f5f SHA-256: 37b64184b2cf2e7edaf00ec5c3bdbe1f80a87f09975b23df7c3a8845baea1799
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://officinedesign.it/userfiles/files/zuwipijomupukavel.pdf In PDF document text
    • http://perlawarmii.pl/userfiles/file/xesironodoperuvalatezisa.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/76879208902.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/82687159084.pdfIn PDF document text
    • http://turexpert.md/userfiles/images/file/jazejipaza.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/nawedofunadoga.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6201c70f---gagulimuzakominil.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d06bfe3106---fovojesudowajutarofatewas.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/datusejis.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/wedufopotosazunonuzaxe.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e639a531---85456058009.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lq025dg0bkqo6e8btf92c4d8c1/96552352596.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/4639868799.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0252b3be---mowijulezojupasufet.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/netiferipufirexenek.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/65770211431.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1f9d378a97667a14d21ab92742dbf649/samedokuz.pdfIn PDF document text
    • https://htchninc.com/d/files/senosoxujo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2133720bb3399d758ec40ed12372f90a/panikofubewitunadosejeza.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/092v25kfghqc1g36om8udph3a1/69198971325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=manually+manage+music+and+videos+without+erasingPDF 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_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BA 17928 bytes
SHA-256: 68df199b8ed43afc26e9c02e7d8715e3653b5f35c45676501e45f458fae7c758
font_02_sfnt_off000156ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156EA 11176 bytes
SHA-256: 61b751afb3c69c2b726f7754f9ee82175cbbbbdf938afeb8e988c8dcdbdf6e61