Malicious PDF — malware analysis report

Static analysis result for SHA-256 5275215cfbc76996…

MALICIOUS

PDF

87.8 KB Created: 2021-09-10 02:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c56356bb91f9244154cfdcbffff2254f SHA-1: 46aa5ee2cf4f256d45f7b48a3717c2fb701ff7c0 SHA-256: 5275215cfbc76996b0e88205fb1cb9c8ef64ea38b6bcc506f71ff3d35df11aaa
176 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The document's structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b4f209a9---rijupabiwedigirigiv.pdf In PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/76745736924.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/gavosixorimalizulivofexim.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf4d76d32---48161807241.pdfIn PDF document text
    • http://retailcop.ca/files/vedifiwu.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4785c2b0df831d9d4d2fb49118732e74/puzamalenosegurobeko.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/gugoxipasexovofakofef.pdfIn PDF document text
    • https://andrejc.si/files/file/78654983425.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3780179e---nuzeforufajojirubinumo.pdfIn PDF document text
    • http://cochemical.com/upload/files/94806977631.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/butosimixonegeb.pdfIn PDF document text
    • http://teknis.it/userfiles/files/8042822100.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/xarimu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237cc3da40---nekatotukuxamum.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345fc1a0b49---79290272860.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/xefizuzomasaregi.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/5061658059.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/48360317753.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/wofobu.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/tuxejaresitefobarosat.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/pozugolulez.pdfIn PDF document text
    • https://filetorme.com/upload/files/85744440339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=beyblade+burst+hypersphere+qr+codesPDF 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_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 18532 bytes
SHA-256: 671fe98629640c9cb7ce8f1d1ee4338e5bb44e7db319123a4bc4b911fb0ba0b3
font_01_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001382e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382E 10968 bytes
SHA-256: 664b77878497961ce799b7879bc5966666281bb9f914257519499ce9d19ebbbd

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