Malicious PDF — malware analysis report

Static analysis result for SHA-256 e278bdc23e8738ab…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 12:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b7153b352b5ed86d23174e29062999c SHA-1: 271cc7a0590e5a0b0784ee01ea89eae1cbc0449e SHA-256: e278bdc23e8738abc51626820b6255c3f16bccbb13d6c8d82e05abcfb2c5a9a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=the+brothers+karamazov+1958+full+movie
    • https://castilloexterior.org/ckfinder/userfiles/files/rosizegevo.pdf
    • https://razredna-nastava.net/files/xamiwatomitozuzijarutega.pdf
    • http://chinhsuasolieu.com/media/files/76258110581.pdf
    • https://xeroxexpres.cz/userfiles/file/13424524783.pdf
    • http://madveras.com/ckfinder/userfiles/files/18989113220.pdf
    • https://cliniquemyo.com/userfiles/file/lonatuxomobuw.pdf
    • http://newdimension.su/userfiles/file/97985024893.pdf
    • https://bhiringisamsankalimandir.org/userfiles/file/xarafimigekat.pdf
    • http://ooexperience.be/assets/Image/files/65066577060.pdf
    • http://szm.hu/userfiles/file/3982790303.pdf
    • http://pkpneu.cz/userfiles/file/tikokipuvakikabanox.pdf
    • http://hbaoge.com/upload/files/mereliza.pdf
    • http://ukrkarta.ua/fckeditor/userfiles/file/gowubojewuzirofujomudaf.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414192ba73e---zobidobobos.pdf
    • http://deeringbayrealestate.com/userfiles/files/22110704968.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/75128940350.pdf
    • http://capri.lt/userfiles/files/70891041512.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ef1be5e7e79c21a7a142147a73e1b933/xarafipe.pdf
    • https://alohasafaris.com/files/24188544725.pdf
    • http://siripanyalamphun.com/user_img/files/60888889726.pdf
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/45948412886.pdf
    • http://oldadmin.k12cart.com/media/files/pewanakavisod.pdf
    • http://rpsbchamber.org/editorData/file/50809511897.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a731c2a14f63c69f0cf202e9cca2891b/wemudumakigode.pdf
    • 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_off0000d48d.bin
3357605b1cbe87f9ddb2f0aa6588328a072b604a4c37e114642cc54f9ae2f11d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 19632 bytes
font_01_sfnt_off000106d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 16792 bytes
font_02_sfnt_off00011ee9.bin
a9bcd3f7cae8e3a1de1c839ae4fd4ede8ecf9adbe4b8d917bbfc0329be5ffd5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 11356 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.