Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a79e4b3e7822b2…

MALICIOUS

PDF

79.5 KB Created: 2021-06-16 15:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 269054a74e8af6aba9175f92be9db766 SHA-1: a09d31a062dd494b63df414513d5ae668676e43b SHA-256: a0a79e4b3e7822b2d6d021ca6e92789e0f4a7cd561ef5ecf7c4e01137266585e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised WordPress sites, likely serving as a link farm to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://laborke.ru/uplcv?utm_term=tubidy+mp3+and+mobile+video+search+engine+apk', suggest a lure related to downloading media content, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=tubidy+mp3+and+mobile+video+search+engine+apk PDF link annotation
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160babc82a0701---53218724479.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0fecc3f4---lupinadilimaluliziluwodu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/69cc9ad04f9f3b7c36f8e07cabc7e5cd/59836655121.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/40633655329.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/wipasularefanezopid.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f031e0ba7a1d01c0ace86769d32a92b8/82853784608.pdfIn PDF document text
    • https://people11people.gr/uploads/File/tawuwegofopotavesiwopam.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608251ac998db---raxonerugigitabetisupafis.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/c0pbj5b35dt3qlb186u63ltvip/45258868331.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/61d020717ac1061254e647e0e50c7807/sanibuguduwakigadopow.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/150b271cd64bb278642135f15ed9f05d/46884312664.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/menimazepifaletazumajurez.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e00bef6a6---xivukiputivosazizifa.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084132eb308d---detepadunirap.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c06a0ff3---92059262899.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16093a95f4a0b8---doziliwumewodigulajoxap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 3352 bytes
SHA-256: 15254d9bc15d4a81b25b50bcba715fb388e70931cb6e870922b7ab60b3c07ac7
font_01_sfnt_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 5964 bytes
SHA-256: 2400b8b0f46117abe1a6f54bef353b28055fba60a177315c340e7793157fb4cf
font_02_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 10344 bytes
SHA-256: 7ab0d88b851b3ba972d238e7b0381ae387e6920adad3208ba6ccf69810c0ad0b

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