Malicious PDF — malware analysis report

Static analysis result for SHA-256 2767a16c7b7ce131…

MALICIOUS

PDF

88.8 KB Created: 2021-06-30 23:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3d0e1b0380775cc99a749718ef1b2ab5 SHA-1: f5a305f30bd41ae9cbe111a41b5e1a6226b8844d SHA-256: 2767a16c7b7ce131960f898975cffef07922dad4f5b29a04edaa7dbbbdd0e690
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://arch-teh.com/pic/userfile/86988085472.pdf In PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/xebejopaz.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d38f1ec0d82---37226160387.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/bepaxopibinoxigumaporowi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9ffe596c---68620277261.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/jadirura.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6906ce326e---xemuga.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/upk5gogc939e9hrk9jpl017tge/63277619812.pdfIn PDF document text
    • http://email-database.info/userfiles/file/26894196798.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/40c99d6d1e407140c877b7a14d71b325/66320276623.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/muwulesoni.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608878a932e40---84183972124.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088b20841657---55709721503.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/bpsopjj5b9pqvumtq5dpvdjlg5/jegar.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/1fe3ecd865e118e3fc7080d18bc278ff/kefekurizaf.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/41978543660.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086920ea8b8a---52589261685.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/jabavogezidifow.pdfIn PDF document text
    • https://mfdesign.hu/files/file/35250347095.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/tenesotasuveda.pdfIn PDF document text
    • http://gerocuki.hu/user/file/39937927522.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd610cc1e---pevimugewugatitedorajowi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f44685efa070a04a1b184fcde84fbc03/83950545297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mobile+legend+mod+unlimited+diamond+and+moneyPDF 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_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 28884 bytes
SHA-256: db42ad45cdcc1178f351d85e3d680c26f9b95cc04ce62d5e009ceffe34381afa
font_02_sfnt_off00013d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D78 10672 bytes
SHA-256: b9ac376064605d5f7071a2baa096e50559a54cf24b3347a2a911308fc7344bd2

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