Malicious PDF — malware analysis report

Static analysis result for SHA-256 817dc725c9b0d43e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 11:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f5b77a2105d66c59e51f3c4ddf379cf1 SHA-1: b5ebd25d4073678465c26ac2e9c0f57ac8b419f9 SHA-256: 817dc725c9b0d43ea8b95fa72235c886bcfb6ed9c2b9a792c9b9fc1abb61f3ba
156 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.logomarcanet.com/userfiles/file/51907727580.pdf In PDF document text
    • http://climtech.com/files/files/woxojax.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/616904485.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/zoselenigokokelinido.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac86e5b3ea---welesapijiwuzugivewitebu.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/wegedajujol.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161387535a52c1---82308563201.pdfIn PDF document text
    • https://serka.com/serka/upload/files/56088831406.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/99403832171.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/52411578912.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/buwavusirozenuribasujovow.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/nusabujozaxebiwog.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a8dc48ab5bb41a65d5e9973ed6a30bf0/gubifibuvujapudotelew.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/3159269783.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/kenemezogobupago.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/60526273542.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/gevoxoxivoxipixatulino.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/17222150808.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/gubumigowumamub.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6bf4529d248fa4afeeb93fb276f618da/vupikevebula.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/59181951657.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210901050252.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/nosoxiruk.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161357cfa4df2c---63707924077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=app+blocker+extensionPDF 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_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 10520 bytes
SHA-256: e24546a92d866e17768a64b21a1bcc3da7c25e13a93f7724475f18a81bc448d1
font_01_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 17404 bytes
SHA-256: 56c2484027aecf776d5d8156b14233f6cba36a307d22f672e078d262d577472c
font_02_sfnt_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1