Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bb82030b51090c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 17:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c146d5955bb463edeffcafdb01f3264d SHA-1: 7631bff6d82d4c880dd3446f00fba3ad4458ea7b SHA-256: d8bb82030b51090c60d08d9bd20238eefdeccedb95756aac5f80115da4304b82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains, likely to phish users or lead them to further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users into clicking malicious links, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/65etl68uoohjg6b42j2b82geg9/rusipuxisozox.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a28dd8f1521---11029858531.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3k1gabvk3nfef2gdqdbb6n1ml0/96078746546.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/lokimogozulojofipewipi.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/1ccf043e3256eed9c970a9283150a794/begipimafagukota.pdfIn PDF document text
    • http://licausi.it/userfiles/files/52849845822.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aedba83587---rarovox.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/tavagigiwafubimedejov.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9de50d3b0---wupedebuwebikorurow.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4f97790ffb3e60fde075d5ad7593e5c2/35320429724.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/61332330289.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c08a203856f---nawanevo.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/jejezemosafopib.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53de107a9---21476398405.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/fudikevabiruzilu.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/gojojan.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/61715771873.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/duravilenav.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a33bc295c---27496694129.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/19684298159.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/kiwopofege.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac1db4565---97019398302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+compress+pdf+in+computerPDF 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_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 10748 bytes
SHA-256: af1e634f0f0738ee818475a716bae6a8f6d2d473cfda93cd62de97aa4b8de29e
font_02_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 17504 bytes
SHA-256: e5fa6255976e3bbc7b67bd9a4ec179405d1e2added7dde91bd46fb6d45a1162c

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