Malicious PDF — malware analysis report

Static analysis result for SHA-256 70849d215ca7f0d5…

MALICIOUS

PDF

88.6 KB Created: 2021-07-14 00:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 715341ba43160fc28e424847ab460379 SHA-1: d367416b4add0bec14f05cccd5374fbfbe73b563 SHA-256: 70849d215ca7f0d5f08d1833be989b914bd2af38f63b7a4f76850b38666a8651
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external sites, many of which appear to be compromised WordPress installations used for hosting malicious PDFs. The file also includes a heuristic indicating a security bypass instruction, urging the user to disable antivirus software. While no scripts were explicitly extracted, the presence of multiple external links and the security bypass instruction strongly suggest an attempt to lure the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=unable+to+open+pdf+email+attachments PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a39669c3596---mipabofelonekixonabeputul.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5a7cc006195c1f8469cccda9d57b51c2/84880661330.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/juxoxofuxabanatowalet.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/diwadewad.pdfIn PDF document text
    • https://senfina.top/uploads/files/40321450956.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/64034260d71de331dd155b253ace8eca/39760030427.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099209bc08a5---sutijuwofoxobar.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b20fe6a7aa3---mowekapazazototuvexu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ailb5sochos862to63l7i59ef0/92308550804.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/wuxozanisivis.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/jerosulatuvexokojevor.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7ac673d627012fc3eb6e531829fae024/70994381835.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3a4d1ad91---dijuvotimedibiti.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/futugetotobeboki.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/59380707238.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901e83cba45---86381991002.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/sujukogununejigegewif.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/be28975b533f131d3bf99b847a7de968/71164919822.pdfIn PDF document text
    • http://normel.org/files/upload/file/vumilerofunosevegimalawut.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/kiruvipadewod.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/gelonorilotebugojugawum.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c820cb43---84630099753.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9cb4c66e---19293442863.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_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 10932 bytes
SHA-256: d3d89cdbb4bf9da32937a8d0a78b34d88f265650ecdfe9fa47051bd2543c226b
font_01_sfnt_off0001103f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 17084 bytes
SHA-256: a8d63659123ebc828dbed1ab5128d93357007707f15ac8aca8d57fd2d19a50a6
font_02_sfnt_off00013d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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