Malicious PDF — malware analysis report

Static analysis result for SHA-256 835e9fbb96965447…

MALICIOUS

PDF

94.2 KB Created: 2021-08-19 08:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26adbc57813de916e2a9523967e7cd09 SHA-1: 7c863c782830a724d2c8db5f670aec1508597706 SHA-256: 835e9fbb96965447fb50686c2c8b9b529f834c067a2a868953aba4393732d273
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ketchas.ru/uplcv?utm_term=printable+anger+management+worksheets+for+youth PDF link annotation
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160850440d1a6d---rutukogoximisoragazasaxal.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/1d66249a7b82e4c062b20b9a0fe2391f/ripavexuxesupeduve.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/ganegutodotonefago.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/08082404790cfc7ad2b2f66a963a116a/68015482825.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/45523001695.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9398658e36b8914280ca1263a5a73b33/mawivupaxufoxosasovuja.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160afa0de7dc23---87667698772.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/bakosewesowobojo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2db302a34---liduxezufuxegozazawulem.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609933b1857ef---65752785712.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/igelpjhrtl22t1menu0udtoeft/rubobun.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/r4q165dt3ddp1fmmp5g31ham6e/lirizolodorumivoto.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/95683868466.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885a121a7ed---norijenufakasovilixa.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/gamukobufa.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tadiwotaxonezafovixupul.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/mefegalomebudolum.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607517801b36d---66949215065.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/76169059641.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1mu25b7ho7687t4dp86q6rl4sf/wirufanoja.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/lodenogozixojabonigukuwez.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ocfbn65q8cvfhlo7q54bau4fde/58081837494.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/16286711563.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/mizebetug.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_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 11192 bytes
SHA-256: c77f199a907ef768433ed97e3967e14cbb4b15c53fc1201683ce66dc2d3b777d
font_01_sfnt_off000126ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 16732 bytes
SHA-256: 65488cefbba06cda35e43e8377ddd464a71c0a660800e7c78a0f3cf115d772ca
font_02_sfnt_off00015219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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