Malicious PDF — malware analysis report

Static analysis result for SHA-256 7537ca75a012b18d…

MALICIOUS

PDF

91.3 KB Created: 2021-08-13 15:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3dd48e1c0c13bb48a92ce6ad14f37416 SHA-1: be956ed9007ada8f054dfec10556dd13a730cc4b SHA-256: 7537ca75a012b18d11a6983342ed4d59578fd0b8cda5fca84f541b42193fe729
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=armitron+pro+sport+watch+manual PDF link annotation
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/378634d3397648fce36d3d9e87286fa6/6108622392.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb364305c---58783371616.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/84990766466.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/96753814534.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/vo2nebtm3stp49p40i8f85o4dr/dinofebototova.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/barujuwoborakosetufiz.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202107240852128964.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9225841072.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/60683080226.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16078a18390f5a---24418987669.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899eee146e2---bibimuwemojolodivokog.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4e0efc04910b6c49777b4569d3430918/74408922374.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b3dd05d59---83392013222.pdfIn PDF document text
    • http://humanlitech.com/files/files/nobalikefiziju.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/75493741111.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/kikewitujotupeberam.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/g700q2lfda8ribt41bg7bp31eq/sinewali.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/35feba8f3e5e8744fd4b7a16c51d2497/warafogoridawakifi.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/22408658659.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160738332038ed---tapofetuzematav.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210705201441_sr4uk1.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/856775649.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/xevovuti.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/s508erk0th0v97ab1a0ngcmgkb/16040596859.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79ff0d1ae---60353578383.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_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 17492 bytes
SHA-256: 7a1a8ffa687ff77393f2a5733c5bff580081769884b3665506c2a580d3a1725a
font_01_sfnt_off00012ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BE 10672 bytes
SHA-256: 0548670960b8d43be1c7c0db0175798f1a8b2db0c413c120d10439f7dfe57697

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