Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4db985988ff9dc3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 07:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 20bce8775de062876e23e16b4e55dca2 SHA-1: e861a2592f58893e30bbe5012aef410b54d96eb1 SHA-256: d4db985988ff9dc31ec84e75ab8f79ccb99161252ee6a6bf0cd7edd07497e403
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm designed to redirect users to various external websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://mariopresto.pl/userfiles/file/bepevubolefuzem.pdf In PDF document text
    • https://bimstudioinc.com/media/files/kovobugijorupenunan.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/noxelavarokab.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/2691827623.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/butoxefufedelavura.pdfIn PDF document text
    • http://tai-group.com/upload/files/99198707168.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/50209123034.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/4rbctkvmcieeq0rdas0akmuaa6/26658552632.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/8609752092.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109071205128608.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/83411829099.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/83191254399.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614087501454e---wepulezup.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/tazidexevoxubasezigigu.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/gofetisuremopidaba.pdfIn PDF document text
    • http://robbes.nl/media/files/35456004778.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bolajijomupukapel.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/xenobuduwatenazo.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-12/20210912100003216508.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-10/20210910204512398320.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/xezarimebekurebod.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/93242998096.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb3928dad7---72949017013.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/nopikivizugam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=3ds+drastic+emulator+downloadPDF 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_off0000c4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BA 10792 bytes
SHA-256: 4ab49362b394aeac2a1b9ba6feebea68b76dd01a5b8571d747f01c3d6cb2f067
font_01_sfnt_off0000ddad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 18276 bytes
SHA-256: b03f249ec976ad76da5352d15031926ed7fbab68709b97c1dc0dde80f2692082