Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1817f3d3660404…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 23:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ce3227ce283e633c17e251d8bc4566a SHA-1: 54691c0cabe649e1d51072feef60e1cce149a38e SHA-256: cd1817f3d366040495936f9a3928271031955282a13ad2497c7107a339e2ba21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised or disposable hosting sites, likely to facilitate the download of a secondary payload. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yhbinternational.com/userfiles/file/90583588534.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/3lmngbp061dlr4ijroqlhuddnq/32802322323.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/gibowuxuwokixoxotur.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/105fd99ab7e2421d7dabf8f92814b80c/90504785169.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/644880118613c46d018b47.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/rimilixevesirujeto.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/mekozetefolabu.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109031358126990.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/rorubowuninawawowupifi.pdfIn PDF document text
    • http://logicamail.it/draft/media/71894728940.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/segiz.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/57305414948.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e34e8eb06d---42249923885.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/banewi.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/bifotugejolewisegip.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/85164197792.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/11395065349.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/38295799426.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/xanazikinobasejipeginiku.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/rejuwilabekukaka.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/sexumix.pdfIn PDF document text
    • http://cartopack.be/Images/file/90542864513.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613737610bb66---xufipemaduz.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/38734302794.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce9c69619---sugaxuxabezog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=extract+data+from+pdf+to+excelPDF 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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 18896 bytes
SHA-256: 4352fcf02d4063aa819d54480bf7d276d8061a8b172ceca66477416a8ecb4ea4
font_01_sfnt_off00011314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 10500 bytes
SHA-256: 1aa2cfda080a8cb2dd844189bdb1fdc69e468d15348a8355b982eb6ab00e4677

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