Malicious PDF — malware analysis report

Static analysis result for SHA-256 5562a98318582d3e…

MALICIOUS

PDF

94.0 KB Created: 2021-09-03 19:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 975c2ef0e0b798bc4bebe4c5d151c1d5 SHA-1: 0e6135ea00546ee7458581ec443b45dd2539a984 SHA-256: 5562a98318582d3e8e1313ef7278bcfa645e2ee56fdd30fc2b840bf0d137a30b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=causes+and+effects+of+deforestation+in+zimbabwe+pdf PDF link annotation
    • https://angkortaxiservice.com/userfiles/file/vitorasa.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/32e91a87defe53d05c656b783ebe8f2a/jixopazoxa.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062319262620.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/rivileluwala.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/masaregubedidiba.pdfIn PDF document text
    • http://web68s.com/upload/files/65660793681.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/55387850609.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/85569638928.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/76877581918.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/12310353547.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ecb4a5aa---wepenix.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/fezoputokexowa.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e864fce35b---vamadubami.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/28087192991.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8624e4c574---dubageronanijokevigej.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/42021674313.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d25231ed853---kodepe.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/52812428881.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/rogokemili.pdfIn PDF document text
    • https://hgb.se/filer/file/87885334945.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e85e64e9a400606d2b402e8cb6793c3/32905968293.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fafb873b9---likapoxolevizakun.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/69726756235.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/41688608166.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/76842699619.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/94113963335.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_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 18232 bytes
SHA-256: b6d0dbe5c3f5eb1182fc7da66364ba8f01f5c6c399ff55ee41a7bb493afb097d
font_01_sfnt_off0001376b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376B 11152 bytes
SHA-256: 840e7c6be9ea60f5899d7b6ee231839a85578cbd8ab132c1a4391b244989c26f
font_02_sfnt_off00015163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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