Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e18d29d96c58a7…

MALICIOUS

PDF

117.8 KB Created: 2021-06-25 00:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b32b0fe8007fdf89eea6449cccf48464 SHA-1: c2dd1d1b3afa3baeb00f02fe43035b4ace9c90c1 SHA-256: b1e18d29d96c58a71ad98417cf3639d9d00207fb3f83b1e69f39bcbf618fb3f8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b257126f4f7---35297412566.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b33ebf19---95796651276.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/95582785427.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/zirudilikamero.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f654cb96b3---51605917044.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/fdb36885f38357282eb544f51a630178/midedujedajizifex.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a846703c33a---jevodud.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/kupajamumubisewev.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9a0f16098fb08a497c38132d3d59f1b2/mafarageminudalumuxa.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/37811476253.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/lawenamax.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a35ecbd47fe428074db12d321e06b47b/16234253482.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160826d1abfbff---81807400503.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=god+shiva+parvathi+imagesPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001750b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1750B 3620 bytes
SHA-256: 8ef120bdff4600b4137e698ce533a33845a59cd12df9b8733a59162dc35bc90f
font_01_sfnt_off000181fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181FE 5432 bytes
SHA-256: 8260e224b40ca558c3f346d1b844fad62b514af55d4ac276029da1da705663e3
font_02_sfnt_off00019456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19456 13040 bytes
SHA-256: 993ada25ea8e74c8ad400cb9e85c11a3ae1f0ac47f80d6a996fb535ec17ad0bc
font_03_sfnt_off0001bcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCC6 3320 bytes
SHA-256: 8d038a06cd2251f71850371f86d8dcbd62954400523b6a0d48a110c1c011f84f