Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98ffabd5a1a4439…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 22:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 959a350609921ba78195b5a775d7800a SHA-1: e593d493f846d5229d29a893c09877d79b8cacae SHA-256: a98ffabd5a1a4439cc1ff47308bac4559c61d23d84e35e60ee417ed102c8f578
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many of which are hosted on potentially compromised websites, suggesting a link farm designed to distribute further malware. The presence of multiple PDF files in the URLs further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hotellemaritime.com/hotel/upload/files/fitoxaxipumipiwored.pdf In PDF document text
    • http://palestraarkadia.it/userfiles/files/kogagojosaremixipot.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79291547180.pdfIn PDF document text
    • http://topflexsports.com/uploads/56499556771.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/10573143301.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/domomawizizalaranodebug.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/luxopexiwavifuvep.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gaxafekopinuromaxigepav.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c440ac565---jigovetokilubama.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/69470722096.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/sikadogelore.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/gebawutidafozas.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/90822157362.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/bezesuseb.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a043f67aad---wamafagojakidikone.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/koxijinenojale.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/30519503421.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613145ba4975c---gukokepirugedemu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ad0db820---kibabitododetiroxumofi.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dac309735---luvofudinokiluxobujivafun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=harvest+moon+for+androidPDF 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_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 10524 bytes
SHA-256: 77c11c4683404126c3a237d66a153dbec8693bcadb307796f89e2ba229147aa0
font_01_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 17520 bytes
SHA-256: bc5d2deb757a14d593d248974cfac4b419288675825a220500f52058cca7270c
font_02_sfnt_off00012a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1