Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43167908ecbade1…

MALICIOUS

PDF

114.8 KB Created: 2021-07-06 19:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5f6ca909739421c140c73a907f9ca1d SHA-1: d7006fe234c2ba0dde1c57a5551b3ee102af0212 SHA-256: d43167908ecbade19f473a8621ecd96e7e50aac3d9c7e8550ded90a30235ee61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains. The presence of embedded URLs and the nature of the link farm suggest the document is intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://ketchas.ru/uplcv?utm_term=hb+guidance+manual PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1ad061891d74864aad1075320f5f02c4/73203592553.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/23822735796.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/regex.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/revurefivafonegekomo.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/571cb5fb462df357027fdc4bf298c176/10258412763.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/setusakagevufosirubu.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/c10dt3db232fr9rv8k5bervlsr/witoruliradoweruvofi.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/tazoda.pdfIn PDF document text
    • https://bachson.net/upload/file/doverikabog.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/43164523862.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/54569036908.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a08a7bf4---40103843271.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/38235229713.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16095cede0f84c---worifizegonex.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/pesegejit.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22639da1533e1140737db3173e33c959/puzis.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/2703110jf33mitcsrle7q45203/mitigopuginiwomo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609268dbc1cd5---siwino.pdfIn PDF document text
    • https://premium-house.uz/images/file/wurifu.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210619022744.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/95f094c0b855611625e66cd724c9ad3a/83808498748.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/sazafasurutavar.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3da98ffdc---52531003602.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001444e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444E 16428 bytes
SHA-256: 31099b7b112d5c022681a0c773766564faa13e87d6316958a6a42a3f95046d49
font_01_sfnt_off00016f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F09 10460 bytes
SHA-256: 1033ef9da820228473e1b7e79b08d58e4b69895135d527fe9162d1df8ddb5905
font_02_sfnt_off0001866b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1866B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E7C 19080 bytes
SHA-256: a0616a79b568e7f5af61dee4a75ed48a694735e0b3649cb9602cf0724fb6a59e

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