Malicious PDF — malware analysis report

Static analysis result for SHA-256 477edc45ce2615fb…

MALICIOUS

PDF

91.5 KB Created: 2021-07-03 03:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d10f341ce6d8dd779616541052ef8e07 SHA-1: a891b87dacce3afa06c6bbf9a0ee8cd97012924b SHA-256: 477edc45ce2615fb752d3fc3e46ef2a1f52b2ee344b77f38447ede379aeac314
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, redirecting users to various external URLs hosted on compromised WordPress sites and disposable domains, likely for phishing or scam purposes. The PDF structure and embedded URLs suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=best+fruits+for+weight+loss PDF link annotation
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a63eb42a56---sexug.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f7fc986fc---99737717716.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/6qi8puti3e83krrq9rp4fb9kf1/19462667321.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/riponedidugibebiwuze.pdfIn PDF document text
    • http://goref.ru/files/file/tabirituduteganudibud.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a2ab5e60e161c8d26d1e2ade8aa12a95/63340057460.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/ludepazajesuteratogijabid.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/vaxewolotom.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b73def41---golizekumev.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19629c4a2---26160558484.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc3dea2bb6---radam.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5bf26ce9cea9405a3f231108e283e0b1/8415871668.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/e53946dcc648da616de658ed2543b7c0/36776353256.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160847ceec51b1---33587111464.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/5pldl0ocmgr0nfgllpbkjqlhc5/sukumipif.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/larusanuwemevavirasu.pdfIn PDF document text
    • http://rubensova16.cz/files/file/wamogofazazeduluxafute.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/posokumutedawefaw.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/66863030698.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/xuxirozazodepokozodoloras.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094828e6f1f6---sitifosotobagesadiw.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/wudafatatawudug.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbad1636df7---7177380805.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_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 10464 bytes
SHA-256: f184de09a369b0d4d9e242299f26b35e7fc5eb92aef7d677360f11e9c20f0a58
font_01_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 16952 bytes
SHA-256: 2f797713663e94ff9c29dcc301b7d6d1814fba66d6efb33d3673cf202932b6fe
font_02_sfnt_off000148fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1