Malicious PDF — malware analysis report

Static analysis result for SHA-256 614d31faf26bd32e…

MALICIOUS

PDF

78.5 KB Created: 2021-09-14 13:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ee38cf936254037c0de4f41a0eb272b SHA-1: e3922b41da808730cc32eabc34cf531d1c268aac SHA-256: 614d31faf26bd32e996bf995ae0edd8e7abd202134cc21222429bf12f97bbe0f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ros.by/ckfinder/userfiles/files/71782118020.pdf
    • https://turdv.ru/SITE/files/editor/file/65266445289.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/8509903538.pdf
    • http://sahrugs.com/userfiles/file/zixorefibazit.pdf
    • http://trubaopt.ru/content/file/14522277086.pdf
    • http://darstin.com/userfiles/files/20592261274.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344fac20b7d---58830648506.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613008aa03bb8---vawunagi.pdf
    • https://caraudioshop.ro/mm/file/17462249016.pdf
    • http://agisma.ru/files/pages/files/8000503276.pdf
    • http://shepardinteriordesign.com/rw/upload/file/bogamagirorapopisozif.pdf
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/59067437690.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/wewodevomosiba.pdf
    • http://ekonopuntos.com/campannas/file/mobilufokugob.pdf
    • http://deepakbatteries.com/uploads/file/14969400572.pdf
    • http://gddfboiler.com/uploads/files/loduxidojodavu.pdf
    • http://dnt-mayak.ru/content/File/vulavoniberanavozuxeko.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ku27nuh2d3vinlc5hop3ci052k/xizexefexazuvanusetuzod.pdf
    • http://erbamedica.org/userfiles/files/rapavumuxomagutosu.pdf
    • http://terhautz.com/upload_files/files/67293827595.pdf
    • http://traslochimontalto.it/userfiles/files/32558134719.pdf
    • http://easyreturn.store/userfiles/file/pobijipugaketo.pdf
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/34377758772.pdf
    • http://artwatch.ru/userfiles/file/50410062275.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=is+37+prime+or+composite
    • 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_off0000cecf.bin
6ca89a05b4438882f3a20c1d46d7d578debdf0be98f7cabd23b6a69e42d12bc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xCECF 10396 bytes
font_01_sfnt_off0000e678.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 16792 bytes
font_02_sfnt_off0000fe8a.bin
23403a5f4ed743797084bff17c00e5a3c80e1b8285d0c92724d4424b55040a0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 17812 bytes