Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0d4784b2073e8b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 15:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aad75dfd3ff2537c6e5f53c6d0439933 SHA-1: 4ee552eb72c0f55a6832264d6576749e66b22b7b SHA-256: 6c0d4784b2073e8b40b42082e21ff6d54370a05018f7cfcf93c0f61898c68583
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://marblobathware.ph/app/webroot/img/files/36423113715.pdf
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/mobalesitaperekusiparinaw.pdf
    • https://newsru.md/upload/userfiles/files/28342271273.pdf
    • http://gemculture.com/userfiles/file/2411606039.pdf
    • http://marsalanoleggio.it/userfiles/files/36710464685.pdf
    • http://prodottoitalia.eu/userfiles/files/gilanokamunabozupogulatek.pdf
    • http://esoftland.com/userfiles/file/dafejipajowanikuponi.pdf
    • https://mami-m.com/Uploads/userfiles/files/14058136555.pdf
    • http://lex.tj/img/file/sekolubuxomomupirolege.pdf
    • http://www.klimavill.com/data/editorfile/tuweru.pdf
    • http://cee1968.com/ckfinder/userfiles/files/95067225661.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161503ea74c774---46658778882.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/xusewajalivakasutogaloxeb.pdf
    • http://hud101.vn/webroot/img/posts/files/34216399184.pdf
    • http://allier.proximeo.com/ckfinder/userfiles/files/6752667356.pdf
    • https://robustbrakes.com/administrator/imagetemp/file/zabamakuwofadopiputaf.pdf
    • http://dasbluemchen.com/wesukiwigavuvax.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161351415745a6---73374314193.pdf
    • http://azseal.net/uploads/userfiles/file/62446485927.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c2b73991---69181443496.pdf
    • http://wmsone.com/eimages/file/najalix.pdf
    • https://sadex.pl/fck/file/33847689947.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/14d8456b714d9749691fc7a9d2ccaa5f/pejabokitip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+retrieve+deleted+contacts+on+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2ab.bin
049ae376dff4ec5314105c56a61cbacaa4269d87cf03b6f7cb5ae0673b49a200
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AB 10756 bytes
font_01_sfnt_off0000cb57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 16792 bytes
font_02_sfnt_off0000e369.bin
e919e933361fddca9255424aa557a8c873f7e052013928541aeaf11ba046ad82
pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 15604 bytes