Malicious PDF — malware analysis report

Static analysis result for SHA-256 312f9bac8c3545ba…

MALICIOUS

PDF

94.1 KB Created: 2021-09-17 02:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 721b37fec83127e5d8b3b221a7211d3a SHA-1: 1df5aeb1e38601d8a8bdff585fe2dbd77ef43fbc SHA-256: 312f9bac8c3545baac2026a0029cfff4794062b74c4fd6f8f1eede69f623932e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of 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 URIs are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://drafthe.ru/uplcv?utm_term=juego+para+android+descargar PDF link annotation
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1fdee18c---mukam.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb1621f3f---84016345415.pdfIn PDF document text
    • http://hkalc.com/userfiles/20695580203.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/814413765.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/lalaketez.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb5345761a---23332377363.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/4088705930.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://jerseyshorepirates.com/userfiles/files/77943192209.pdfIn PDF document text
    • http://qdjshg.com/files/file/91770760693.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/93920034369.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/kasifusub.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/84933289989.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6b244465---vufatuzeruji.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/36154049822.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/32571579352.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/32065598533.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/wasebunakafemasef.pdfIn PDF document text
    • http://rilta.net/userfiles/files/56151137322.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/rulijejedilutema.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/94766596946.pdfIn PDF document text
    • 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_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 19812 bytes
SHA-256: d472ec53ba8dee3a429551d9a0a3b6fe75b86a0481d3b32e91c32d03e1730ea7
font_01_sfnt_off00013ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152CF 10636 bytes
SHA-256: 0b4b4ade64733d93fe3b16613fcd2c11735d7ea813e0bf378f95fac7eea78914