Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0725530e1ce255…

MALICIOUS

PDF

75.1 KB Created: 2021-09-28 16:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75649026873555899b9df8d26ce02deb SHA-1: 7ce4b0bac9b4576b110b37cdc9123020d1838ddb SHA-256: 3a0725530e1ce255b7ca75ce3c0a6b2806195c09b60f5a4b7bc08f8fc716adee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories or other unknown PDF files, suggesting a link farm or redirection scheme. The presence of external URIs and the overall structure indicate an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161416594ef40c---fufegi.pdf
    • http://dietaltop.com/userfiles/files/budumawa.pdf
    • http://blessingsngo.in/userfiles/files/1661406302.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/tagemurafofelomi.pdf
    • http://manegedebuitenwijck.nl/uploads/file/67397065096.pdf
    • http://innobiztour.com/FileData/ckfinder/files/20210927_2F5BAF30B973270E.pdf
    • https://semangkabiji.com/contents/files/38841998584.pdf
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/futegozato.pdf
    • http://xutricolor.com/uploadfile/files/netewafis.pdf
    • http://redskap.ru/userfiles/file/83196395233.pdf
    • http://vsrru.ru/userfiles/file/60050940391.pdf
    • http://lnianemarzenie.pl/userfiles/file/regopepomatomukugetegok.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dd7a670df---kibuvowesakivoxunixu.pdf
    • http://staresecurity.com/userfiles/file/57908098965.pdf
    • http://benetalent.com/upload/files/vimimalojo.pdf
    • http://24horasnoar.com.br/ckfinder/userfiles/files/91035356248.pdf
    • http://teamtrinity.net/trinitya/file/6731286994.pdf
    • https://eqonetech.com/upload/userfiles/files/17177892463.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2793e11e5a97d54c063b73c8178f36d5/12898069240.pdf
    • https://najemwroclaw.com/userfiles/file/75136429181.pdf
    • http://24horasnoar.com.br/ckfinder/userfiles/files/17349484976.pdf
    • http://i-daa-wl.de/userfiles/64025889586.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=it+chapter+2+full+movie+in+english+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b944.bin
33f5d1b38cb6f41f01bfd9f110f2be83f620a9d15355cb752cdcf1fa17a32a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 18832 bytes
font_01_sfnt_off0000ea3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 16792 bytes
font_02_sfnt_off00010256.bin
ce68fb4c9c0598cf21febe7b815400edceeecc9682564f7ff6f7d8569fdc4a6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 11164 bytes

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