Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d9c1368e29c8f9…

MALICIOUS

PDF

91.3 KB Created: 2021-07-23 13:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ef101974f64782abd9a9b36a1bdd8e8 SHA-1: 69b00d29f3c457a9379ebbacdfe08d3f54ded7fb SHA-256: f6d9c1368e29c8f9db6400c6279e5f59bf74168736e5edd04cec925ab08bc1f9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while numerous, do not appear to contain executable content directly within the PDF itself.

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 http://mastervgtour.by/var/upload/file/vebobujadusuk.pdf In PDF document text
    • http://mashtalkandil.com/userfiles/file/kejepubezejewim.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097a2941466c---todogezagipofobifaj.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/wisakosamux.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/10701654046.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/lofusodegolaxizulagavod.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d9eb4107edc---40107306272.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/siritimotuvopanonixililo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d52215810d---79484284805.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/gapupufesezezu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/7c54df1ed22f7c2860f531d5fa685965/xabuwozawogewabezeki.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/xedunelik.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2ff7869900b1943ab630a4414743e63c/72467956879.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0e08d39655038f913fefbab83c0af241/tujitojevaga.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/302ddfcce7fc697f2bf26cf215ba8f09/99021972328.pdfIn PDF document text
    • http://krzeptowski.pl/file/95728878349.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/57331748435.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/nanin.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/giropuzufivuma.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608dedbb2f457---43514885642.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/mdtd6ghvtjtgveov19viej33v0/ligevepizufewabuv.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f022ojepmr2a14pseb45madgga/56703938106.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/13716224043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=puff+pastry+quiche+spinachPDF 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_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 10772 bytes
SHA-256: 9e57eb913a593677c7f065ea05fc219d586e74807a315296c2134c5e9e700bcf
font_01_sfnt_off00011a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 17220 bytes
SHA-256: 58b7b89cc1b35e9dc30a2ff39b469d631c4b46e966b36666cf164dd0da7655bd
font_02_sfnt_off000146bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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