Malicious PDF — malware analysis report

Static analysis result for SHA-256 25348eca79423a57…

MALICIOUS

PDF

87.6 KB Created: 2021-08-17 07:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d2524f99274350dcb721bcd41faf86c SHA-1: 0dfe66f735303cf53dfd933c03537e7812321310 SHA-256: 25348eca79423a57c74fe240df37c04117cb0b5083d90bc7ddb5be4d35fe71fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the embedded URLs are the primary indicators of compromise, likely leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://inwebjor.ru/uplcv?utm_term=abecedario+en+espa%C3%B1ol+con+imagenes+para+imprimir+pdf PDF link annotation
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611549f71ee47---45799075013.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/sekimusojuloxuxovu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5ab41214---gazedudixigomugoxo.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/kewopawesuxipegikekezubi.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/sudilipajafolekadiga.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/23333169031.pdfIn PDF document text
    • http://compsult.net/userfiles/file/sizutuditotodid.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6cf362b10---52215168605.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/73rd14lb9i6s54ptjnabmva2q0/77334377119.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f627cb3f275bdc3fe7725251cc068bbf/61606255963.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/f5ti4e2mrosmf0do2cn8ovhj91/13608175493.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/22766211538.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/ledosewonudumegutujevorax.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e415ab43a---vepenapidajunuzafe.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc07e3405190c3659c03ea1fbd8e13ee/50634529591.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd369c1c02---28986468708.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/164422734.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/918a27873b3251b5d07a6ca2b16eea9e/lowalavodawexajubetevof.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099d383bef5b---67202220456.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/nazomevisaxu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb19c458b---pofasererema.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/65464448454.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d6aed003d---zenitibukivefonuworifagas.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/wategilulufifevaz.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c9006b5ce---42913337664.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/50947558216.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_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 20248 bytes
SHA-256: 88f4bd98339fbdc3d065d8df8f7c4023726bfe3db392c6605703716a74f98d66
font_02_sfnt_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 11192 bytes
SHA-256: e0825db26d1392475ab92ee2131a274863cd9f0a88454ffaad6d5988849d2ede

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