Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dff0810c24eb7e6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 07:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46e9a1fea40901b0755ab71b8ea86c68 SHA-1: 7685baab88de9fddb662cf314dfada37fe8abc84 SHA-256: 9dff0810c24eb7e6f45dccff030d86c6c2b8f34a821fe9f49ac9b2bfed066ee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/uplcv?utm_term=role+of+training+and+development+in+hrm+pdf PDF link annotation
    • http://mp-journal.com/media/file/dopozafopemobek.pdfIn PDF document text
    • http://tipiland.net/upload/file/18822058524.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dae4aed8b---73764127825.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/212759db2da45e38fddaa729e9446123/mabuvabobopekujejorob.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/pafedudemebi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612426c665623---vukonanipanumok.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/sotomowi.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/17726663838.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2bfd83d8c---20071212234.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/eb26cda90024f15b2ff61d23366ab99f/rotomuwevarozezubetuju.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e77cf6a6---35045457675.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/52dac65057d89b759df802494f386e83/zugopefabiburag.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccd6f12167---nifiji.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5101cb023---37005577808.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/76837054335.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/58966311958.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/javapagetotin.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/f39s425jf5hbsbd6l5mfc151bo/25031421674.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/86646588851.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611259129be96---xenosalefetaxoxubamaluwo.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/pemupefesixexagok.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/48483521477.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_off0000c346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC346 14580 bytes
SHA-256: 2a907d0459456ff87a7062fc90de5e2cfb448ace82f3f1bd2567946bff245114
font_01_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 10888 bytes
SHA-256: a1a6c8d4fd667c0d01d2b7b56ba00f9bf56d980612678460089a3bf172582c87
font_02_sfnt_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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