Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cc71315a10a3b3…

MALICIOUS

PDF

103.9 KB Created: 2021-08-10 20:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 68a560d0ccf9cb0c34bea0c391a7dfec SHA-1: c0c594a37107af38ea25c1f033cbf50c0469cd50 SHA-256: f7cc71315a10a3b374893cf5d9ee4c794dc8c72255468ce204b7edac0416caf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, with many URLs hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and link farms strongly suggests an attack pattern focused on redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://archism.ru/uplcv?utm_term=nasty+gal+free+shipping+code+uk PDF link annotation
    • http://tsg-edinstvo.ru/userfiles/file/joxagiwikotulit.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/rurexi.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/ziwobedunofaxanu.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/5315bi8gj5fgho3t1o5haoijua/kebitaxezi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e179a087d---kowagozix.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/30493900418.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/luwuxarudumekem.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a3b71c17d---48211684056.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800b2591b4e---56378951167.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607456e0af3de---572702210.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8d29c3e4c116e19708dfce099640b1bc/15263313696.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/wanuw.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/35cc36affd1713fac435d53770e187d2/fivizakisegasexipasiled.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/6ffb11fe75a96fe7a386cac96af1b926/61773407810.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/josejokanovudaburimenu.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/wusuzakiberage.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/bivuraferodu.pdfIn PDF document text
    • http://asfalon.com/__files/file/25306470955.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb3bf55f6a---87517600840.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44159fb84---dukuxagipidifu.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/86521153910.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/97952746868.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/bafopi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/70393422024.pdfIn PDF document text
    • http://lyshiying.com/d/files/48107207368.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/mcjk33c7oo9r2s7aab1ohb8dbi/vupefoxowizof.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1bf1c2679ce87490dc61af67aee0d3d3/1375110020.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_off00012e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 11180 bytes
SHA-256: 8b67e821c5aba1815822966269ff9be695f159488d4c6b657395fada61a4b251
font_01_sfnt_off00014848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14848 18344 bytes
SHA-256: 922368157710bd8126d93ca01235a353f7515e61f9adf48bdfd1d11887c8bc66
font_02_sfnt_off00017893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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