Malicious PDF — malware analysis report

Static analysis result for SHA-256 8333f00366d51123…

MALICIOUS

PDF

105.0 KB Created: 2021-07-31 19:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 929a6ef7e8396e08b85ea17deb64bef5 SHA-1: e8c868b9b9341aae8f1e807f89cdc33a1cf8eeb3 SHA-256: 8333f00366d5112326b3d993a6fbd5b04444aec75c91de094a65164342ee418d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics indicate a likely attempt to lure users to phishing or malware distribution sites.

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://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/94tbj4p4um1j0b0cje1ang4a12/rosozapimezazijizaxe.pdf In PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b37acc674---42065840697.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d6b6058aa92b5d11b4b6a252da7a8a2d/59293356535.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f53c81e19d---23452475590.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/66166260724.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/56189401935.pdfIn PDF document text
    • http://skomi.ru/img/files/file/2991903854.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/74422653661.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160903daf79acd---guzifijugebokus.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608161ffa058c---sesezopifaf.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0e42cc87---63309166560.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210709_211132.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/jufvf8mf4crej5tnc2nurqkrtq/xokugomajuronexuz.pdfIn PDF document text
    • https://room12shio4.com/contents//files/butetitusa.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/105274304140db6eaff2ea570a52e0e1/81410951330.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/birulobofupimuv.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba724f415e6---17005064646.pdfIn PDF document text
    • http://wphs67.com/clients/9/95/95f8299e8098c1f2c85aab0f7ead5e97/File/91689459507.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb6c67905c---bexokirevasipunemegewiba.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/navulu.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062314070573499.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ecc53ef9---99654798436.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608587b0304af---favufimezureki.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/38768584575.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080eacb32c12---wogoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ejemplo+de+introduccion+de+un+ensayo+personalPDF 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_off000135e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF9 17532 bytes
SHA-256: 9565138697f143c5debff530f8743bd4b614e9142c903dc4bdb153596eedb572
font_02_sfnt_off00017a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A96 11000 bytes
SHA-256: c3133569bca765704390486499bea5fa8b5c7fe2bd207f294395ebeb809b1285

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