Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff335f8a7a9d885…

MALICIOUS

PDF

70.9 KB Created: 2021-09-10 17:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8120b3598af16ea0d06bb7296d28f0da SHA-1: ea09b000bbe850e65bc6c2e160a30590ee84ff43 SHA-256: 0ff335f8a7a9d8856e42d2ee569fdbc2efaeba338f7ee48821de2d2307df2121
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, presenting multiple URLs that appear to offer a Minecraft mobile game download, a common lure for phishing or malware distribution. The presence of numerous links hosted on potentially compromised or disposable domains suggests an attempt to distribute a payload or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://skvely-kup.cz/files/file/tepelirojoziminusogow.pdf In PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/30301569125.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/jariwuxesedupeked.pdfIn PDF document text
    • https://edusfera.pl/upload/file/nepetevevesemegiwemowuriz.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130591074a40---28460259653.pdfIn PDF document text
    • http://teresachild.com/upload/files/bawonasimeramawerume.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109052345484596.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/bobelixisejolokugepufeg.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/xexagoginad.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/60790108830.pdfIn PDF document text
    • http://foxadv.net/file/175904415.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae6c8e0b30---gebejaj.pdfIn PDF document text
    • http://juha.be/_files/file/42539909856.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/dokakekiwi.pdfIn PDF document text
    • https://partetesal.ir/data/file/rejijutalowuwaxubilo.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/valijalamuso.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/63529518192.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/8839057759.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/wiful.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3c598d296---7330727569.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/39288748169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+mobile+game+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_off0000b4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 10872 bytes
SHA-256: 0e1c02f936c2e7d69793a771100bc038f9279d114742557aaea20f6b1ab2f8cc
font_02_sfnt_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 15864 bytes
SHA-256: 1dd9769b92ed997534bcf30ae5aff2dfe130b9ec1d6cbc77d9145a5746de1496