Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad83ee81d446893…

MALICIOUS

PDF

70.4 KB Created: 2021-09-09 16:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 03b6ec3cc75565b8e0dfa212d259f748 SHA-1: 10d7352055ee6a723f1b7d22bbd225ef236fd0a0 SHA-256: 3ad83ee81d4468933eca5841add4e1cf7942bee6b3b9a5bcad3722b27d3255c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=minecraft+optifine+1.17 PDF link annotation
    • http://hidramaco.com/files/files/nodesemidumuritajavode.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/99734461023.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad269a35a---72944945720.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/gorabukapejapigefanukupod.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/77871098993.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/tiruzamomiminivu.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/58397230277.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/73402116608.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133625424147---ravapiwiwaguwosego.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/tamijoret.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/23167868688.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161383314b837a---3386073880.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/80844406185.pdfIn PDF document text
    • http://levotst.com/uploads/files/10178891170.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210906_B057C6D0404E0009.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3272b717222d2423d102f342a352632b/bofugeruriwina.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/turedekanogelipibofeduge.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4af13d193278135e709a300ff89c932/97829556836.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/biwakokani.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/suvam.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/3746503264.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/gafabulisosof.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/75189887782.pdfIn PDF document text
    • 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_off0000b2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 10420 bytes
SHA-256: 3b91a1d772906cbc8a9d2cbd1ae69c0a3446ad59a263c5e7ef1c2982e7837207
font_02_sfnt_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 16196 bytes
SHA-256: e2740388df61ce04c67c3a18cc900a789658feda8bea2a52f42e47c4c0208c45

Open this report in the interactive analyzer, or submit your own file for analysis.