Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d06e73c8d0b286…

MALICIOUS

PDF

69.7 KB Created: 2021-09-03 00:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f4c414cb4dbbf8ad5f5df1d08f41d60 SHA-1: ad13573b9975ae3b7d063bae9531d11f7250e15e SHA-256: 04d06e73c8d0b2868e5d3d41ba08137911e3d83e0bc46152e9e788ab69ad380d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The primary purpose appears to be to lure users into clicking these links, likely leading to phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/80079454216.pdf In PDF document text
    • http://shipsupply.ru/userfiles/files/natomoluzevipomozugelirat.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/zalagujubetojez.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c95c178ce---94363572138.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/48b66a76b92bae296b4d141741a95364/xotisotapatonodesifeg.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160834254724d9---lakoxomilawawodifusitig.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/11170595589.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nepofagigo.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/fibotufuridisexujitexobi.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/zusodilanedavu.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/59548276049.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/95690166634.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a972a760ca0---27934351890.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/6079317621.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/wapinusuzize.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eb34bd246---18758243256.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/fekefidu.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/14282630672.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/fumubofufeloselatu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160823ef8e2057---90553639849.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c0c5afaec6503e43061785ef39e7884a/27172301326.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/pejaneraxazejemuforugak.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a632c88a35a---29701421347.pdfIn PDF document text
    • https://loctra.net/userfiles/file/zububenazategarafemiwut.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4179705edb---58167856598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=renters+contract+pdfPDF 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_off0000b574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB574 14452 bytes
SHA-256: fe104256339799b24b8edf8355eafcd0e778c256f8a5bd081d30048935a1cd5c
font_01_sfnt_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 10520 bytes
SHA-256: e460ce4daa2b8203842e53b728674d47237e369c3205919ddb70ea7aad301120

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