Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2829b6af8bbf11…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 08:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 59548cb7b701bfffe6bdde0c54c5672a SHA-1: 034ed3a646d528382b545175ac77189938595f2b SHA-256: 4b2829b6af8bbf1169284efc41fdd68c6f2bb6cacfe50eaabe72169e0728dae8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the use of JavaScript and a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=jurnal+strategi+pemberdayaan+masyarakat+pdf PDF link annotation
    • https://thinkhigh-tech.com/d/files/negozabaziwunubijebib.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/68347486533.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901f546aa12---93501012612.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1d5dd92ed---18118986098.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/20678038577.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f57cacacc1145faf1bbc9e46d9e02363/89524771187.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/856a0bc451328665560143d9722c8a2b/womeferawizatefumupu.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/32645502370.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/54114093556.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/27003680752.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/supasubenav.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/gemasadumusule.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/pilegiketelanazefawupeko.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/jobitupixir.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/wepol.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/xiregudakenoxod.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/95858844133.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/cc2875502d404f58048abb86272c6cd3/87226553805.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/342414758.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/xesuzedel.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210619_212602.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5e7f9375d---rurodu.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/69144936881.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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 17984 bytes
SHA-256: 833b0fc947790aa3b6c5d4335686821e006b9b6c65321df16fd365dc0991bb14
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 11160 bytes
SHA-256: 39457592647241399646dc5a2e5126968cf3383d2315e1430cced0bb4f3d23df
font_02_sfnt_off000120e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1