Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cc1d65955450da…

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 15:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0969715f07d1826297d50a4e9ea898a6 SHA-1: 0d41a0acd92a5fc88f1c9797d7862f05d775533f SHA-256: b4cc1d65955450dae979bca87cfdd1350d0a59b5520ba89c5a3608cd1208d7c1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which are identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document's structure as a link farm suggests it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://reitinguok.lt/userfiles/file/paraxiban.pdf In PDF document text
    • http://sxhk365.com/uploads/file///xujonerikediruvidev.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/5489777218.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d03802a87b---48914026208.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/tonazafafixopomujor.pdfIn PDF document text
    • http://julianina.dk/upload/file/jazes.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/zexiruwixosoluj.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/55629177853.pdfIn PDF document text
    • https://campermagazine.tv/public/file/29815352901.pdfIn PDF document text
    • http://hodori247.com/uploads/files/ziwemizibudefop.pdfIn PDF document text
    • http://contactconfiance.com/files/files/kelaxedopukavi.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/kegutelukugowimas.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/rowebu.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/17713799991.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089afdf75100---29586160416.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/h2vicp08hpjm6p9qks906lnvp4/75828950397.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34275779b---88205288873.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/49988147487.pdfIn PDF document text
    • http://agrion.org/upload/fichier/14060745635.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/11f87370e5a07f86ff6bdc98f49049ca/vijabifo.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/neroneketexof.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/51ecd2c1e9d4d3d710c32fd590a79f03/10520089990.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5014796632---rawov.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91694ecb9a---17785927638.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/2752054078.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/19485456666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=brother+printer+won%27t+scan+to+pdfPDF 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_off0000d21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 10844 bytes
SHA-256: 67f064f253e1b54883b3df64281cbe2156e50efab67f724fd6b075afff013eeb
font_02_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 16104 bytes
SHA-256: 2c896a2d1403ba72c86e0582b9b493b661556b8d309a395ed358ea547baaffa0

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