Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf634d02fcd01177…

MALICIOUS

PDF

89.9 KB Created: 2021-07-01 15:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d253f652bf7f6f7c1b60c918335119a SHA-1: 2bf7a44e5c4776a3364c05572b99807ffcea14c9 SHA-256: bf634d02fcd011770e80aaaaf169c9110559d063332e5a3ad5c5c098dc788244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://inwebjor.ru/uplcv?utm_term=funny+things+to+do+to+make+someone+laugh PDF link annotation
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/dffef96bf96e0fbebb2ec33d6fd9f20e/muxeperimabeja.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085908da0661---85382841981.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/vozejagi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889279b9c89---wumizupeleme.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5e64b5b50fdc2051adacba1d2ad90bce/23691184177.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/8e53e8fe5263c93cbed88452b49b3666/77188714627.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/zabezokerolodetiku.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/95879865680.pdfIn PDF document text
    • https://noddy.nu/images/file/83623856958.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b86482d7019---sawukalexaxukon.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/264c56f5c6bee81d7cb9ec8a5092653c/zitawepejapefosugew.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee419d6cfc---10028872981.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/vatexoxuzopuj.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/46830797819.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/64b4f4f3a08a5d8366018387db4315bd/15241473580.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/3976303351.pdfIn PDF document text
    • http://airsoft1.ro/files/file/80443034486.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/22892298762.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/sazawira.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4991ebbb03---46844948685.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2203895e2cb7173d8e67bdee21e247bf/7905345458.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070e05fb195f---vugepevufikiwapododabakun.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b00733ce102f7b779f5405acea02979a/71999594857.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/388a753e05186971984b7a1c690e3807/21024438719.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_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 17980 bytes
SHA-256: 3f5fede594646d285dd6fc87e48036f9f91206aa9cd7785a193c8556a2bae13b
font_01_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14152 10880 bytes
SHA-256: 7a232143fb278b8171cad950cbb61a3f9fc3aedff44b17c5d38e1255ff6f96f4

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