Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a0325d9c384e24…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 00:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad230e7450a5104e81ddcff2cf11ee79 SHA-1: c0fbf044dbda67a449506a7ee3c6133e677730f4 SHA-256: 26a0325d9c384e24ce867f5b282cd198e299cade06a66b621722350c1c03a0c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded JavaScript likely serves to redirect the user or download a second-stage payload, contributing to the phishing and trojan classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/matominijapebitu.pdf In PDF document text
    • http://tlznailspa.com/media/files/61909607284.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/42057153709.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141c55215749---26025021986.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cefad99ed3---temasevonulitewagimaduza.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/mugedagawedawaw.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/53743092796.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/ripujobelew.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/916828653.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/dukijatizelunafebadakajuf.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/45239160766.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/27211348697.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/ririlutaxewi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f14252b69---xofexaloxodajesufekag.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/45030336917.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/86724959224.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cb7e67557---9837932031.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/31109982588.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a22536dab44cb2b5fb8a97769361fda6/munivobivesavadow.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/rujinasevazalora.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/cbeda21321445adade3ff066b18950bf/womanogovi.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/63632134761.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/64041418757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=u+watch+movies+free+onlinePDF 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_off0000b047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB047 10760 bytes
SHA-256: 33c85144f90f400e892f7f346f54b3090ab63d0639a42aeeb7ceccc2cf548021
font_01_sfnt_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 14700 bytes
SHA-256: d84ddc6cc39b0c266bb206b07b3116f9e8a8322784c619e10ebd76b51c1d6a44

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