Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa64b44f0704530…

MALICIOUS

PDF

83.6 KB Created: 2021-09-08 11:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d8121ef3b023048e57a4c30a1fa5d4e7 SHA-1: a8802420f46e95e3183782fb4889339771cbb220 SHA-256: 6aa64b44f0704530246bb2f76afc2114a4f4f96e10afa3c1cb8e33b5f8594a9e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of multiple suspicious URLs is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=talisman+city+expansion+rules+pdf PDF link annotation
    • http://uitvaartverzorgingsindex.nl/images/uploads/89825404390.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/sabimuzeliketinowuvubi.pdfIn PDF document text
    • http://hanauhrova.cz/files/mitewowovakedigivafux.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/1159809574.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/4322c0a7ffe5b6e3ab8fa8cff56ed408/fazuforafisewapasag.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/61567094753.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ef26b185---71595263235.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/3j1617mhesqshua11gd0tmk3qj/75803320950.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/finisadudinipavuluxeju.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/movukuxikitujede.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mesowijizesozixenekupume.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tudekutoke.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1610be85125c82---83046342766.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9305c92e4---fuwafetenoxezanu.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/jegusosefuwelid.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/92838efc1051f4d04c756fb822eaa996/pijevixilekexabagen.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/pedawolalerado.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/15680896235.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/tevanebizusax.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161000db74bbac---nozefedozegeranofilepa.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/138423402501628013699.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/rujojupapojojetadajo.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/27179972599.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_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 18356 bytes
SHA-256: 8e960f8c35aaac6d230aa9b561830f8bd83b9f9a200a7e69d895a132dea9f012
font_01_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 11060 bytes
SHA-256: 121683e3466ad556e80a4308b117c9022902de5f6ffb7c185c2b46bf93552d07
font_02_sfnt_off000128ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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