Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9940b0516bcec2…

MALICIOUS

PDF

91.4 KB Created: 2021-07-30 00:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b42711357a76431ef3d6e5c613fd3929 SHA-1: b828111517f5b45068021d062d1ab055e8e45c1e SHA-256: 4f9940b0516bcec20b94285ac2d4f6102789c45cdcae9fa9940dd631960757d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba707c44b16---degenazejetilawolamod.pdf In PDF document text
    • http://tencanpowder.com/d/files/54914144747.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/19368690462.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2ea341cd150b82b244c7b6fdd28347e3/40519275407.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/026ee626ec268cbaffef1a61e86c19f5/4809629223.pdfIn PDF document text
    • https://fallsplat.se/file/76494231671.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/15e5130b1c458f1af467f810c73625d9/jexupavimewijowejep.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3089d0055---29985000000.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/duvegeso.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/77471105298.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/metexowaliv.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/79405c56109495a30190e68a4e8993e5/xobedaxela.pdfIn PDF document text
    • http://siembra.me/uploads/files/kekesosuzefi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/13334095472.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbdaaf3ccb---galamapilagi.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/54214324875.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/38603398720.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a7d893c4---xozifasupegarasota.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/483a1dfb42847bb11f05c7874055ebd3/74478782700.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/69580872806.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/28133201732.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/58038643344.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/2181020682.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/86879752901.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/11676635746.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/tevivesegopivapazit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=total+video+converter+free+keygen+3.71PDF 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_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 27620 bytes
SHA-256: 33a825ff5ae75626787db64ecf39c9ef4a99dcf359c4d5752117cb35ade0d186
font_01_sfnt_off00012d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14551 11060 bytes
SHA-256: 74cfa1e9fcdc486e71720817981dbc700f1ad247a931a59f23daa6c5b5980b6c

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