Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba3cf523ae8ab1a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 04:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42fffdc21dfd4f948e264c5815772d58 SHA-1: 19861c7b14260fbad0b13214d364f0d1090ef825 SHA-256: 8ba3cf523ae8ab1ab09d96f6c3b28e4eaa85f6be80152ce28f947c23c20458d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the structure suggests a phishing lure designed to lead users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kovosluzba-praha.cz/res/file/netamitafikomevez.pdf In PDF document text
    • https://faceless.me/userfiles/files/juputodoba.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/e3f418d8fd93142543b2263c752f5666/jijudexexuxo.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2e0a80eca6807a2c3e2cf95baaba2f04/65987476854.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/57444065159.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/80446930039.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/16947989176.pdfIn PDF document text
    • http://bititechnika.com/uploads/file/95480014599.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/51599181387.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/6446061658.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/tawiro.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/samiluduf.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160856c92b0265---69626295805.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/18912419523.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612197bc9267b---78989474302.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/xapuletanozet.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161011cb3c38ef---44153977261.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-6/20210606010249185707.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/nopejarerofosobafanif.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f2c5c7e808616cdb489ca43aa4ae621f/62759185677.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1a17ead7ce6cb1bc2ef2d3171d71cc71/rodujupitujaderoru.pdfIn PDF document text
    • http://jarosi.hu/files/file/kerakopuxivinolakefiworif.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/60332316528.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/6232785705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=vauxhall+corsa+excite+2015+manualPDF 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_off0000b510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 11092 bytes
SHA-256: 4ee76136d2c921b0bb78f75cb5fe28c5a3b717d1e47362900d97bf4ff935441e
font_02_sfnt_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 16760 bytes
SHA-256: fe062aff8fcc79b2ffa53fc916d88391be4fffc56aed3027ca945e27e20f30e6

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