Malicious PDF — malware analysis report

Static analysis result for SHA-256 0607971bb39236ea…

MALICIOUS

PDF

98.8 KB Created: 2021-08-13 08:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a7e31b282409e4b430ff9a5c20d982d SHA-1: 500dfff13c58ffaa0501b79d4d7d60ee593b4d8b SHA-256: 0607971bb39236ea0bc2b6589f36a83f9745e72abdf1f701c6f28da29e4346ca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lead users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7n3ihe9j9jl5888f6nj10nto2r/kukodazebodegam.pdf In PDF document text
    • http://markone-tools.com/upload/files/78873066382.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/40817457341.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/844506950bb29a2b3837bf3fa92842e9/pujikadadevanij.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/12960887874.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4r24mkkt0gqb7np5l45uhske07/92787382577.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/kapasujagonukataduxobov.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a50cb71e79d3d5f306a005f0678b2b4/batipakadokowefoje.pdfIn PDF document text
    • https://hirurgija.me//files/49798515795.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160966b958344c---17128662602.pdfIn PDF document text
    • http://zerosquareonline.com/file/rejiwajinimonu.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/13616713372.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/90722555864.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d541e10841a5fa17aef3f4789074e8df/47978566139.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b2c7dcd75---domekazajovefatowife.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160981ca505ef6---35688289512.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5b07259cc94f11da7e6ca8255a1206b/rutonazekemupuw.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16086583554038---2280102562.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/65960932731.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/29221893464.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c467d16ee36---66436138250.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/lufewezelofemexebopa.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b293421f75e---texupaxe.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/i4jp20halg134uf1sht26q48b5/50083316999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hyra+elektrisk+rullstolPDF 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://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_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 18720 bytes
SHA-256: 8207abfd3fec5c79e85ae9e62c187031a89452a06195967ca654e4d5fdeee64a
font_01_sfnt_off00014cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C9 10296 bytes
SHA-256: afb8d8a23c9e27152b9e4beed183d4e8e83963cb254a468186093c8d4a1e8cc4

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