Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52960712cd60b7f…

MALICIOUS

PDF

87.9 KB Created: 2021-09-06 16:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 74ae5d5d97d8d0d7ccc93b0a732983b4 SHA-1: 304e462f1a0b6107f67fac7bc58b4d1a661effc8 SHA-256: a52960712cd60b7fd36b0896a9d1a1fe52d35c284c802925ce4a87427503ecc5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drafthe.ru/uplcv?utm_term=lei+das+medidas+cautelares+pdf PDF link annotation
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/61284403735.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/2rjftbprdkf665kp9qc8pm5tr0/kujenijejolube.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/414dd20922d945a6d3bd2118558813fd/16093501843.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/46878314776.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/77244836387.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a5efddd20---laxosuwo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612007327d8e8---gupalogikipidirisaxike.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/23951304573.pdfIn PDF document text
    • http://honghuibio.com/d/files/pevavaligonogeduzu.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/0928e6750621ff45e5b4db85544a156e/35674412299.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e540265f329---87304280344.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ugiragjg46vr6bu7cf1ug4kte3/71107437754.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/rigirarinoguxisototuk.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/tefijebozipapuzopetonixof.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e15740660fc16fd5efd806bb3b868565/kelunelare.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/baliduzisageforo.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/pilabemizulafirule.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e68d4ca007174d803b9f452f297a59df/rumemelolorakazixure.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/47856289604.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae011a1ab2---72420204708.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/26699996979.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/gesawonulajamajize.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccae12d1a4d---xogojiduvu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2257dee4cd---2980600277.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/wupefejariwamiset.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f9b1a25febc442ce3f8c71453be5f6f7/paxivozutu.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_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 10616 bytes
SHA-256: 24f5652defb1d1147df00ba267b3cc4ee4e4c53ef7ddc5673b1ddb3a3dd64504
font_01_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 18636 bytes
SHA-256: 9bf86d71cb9b611dae659540bb61b9ee7162af5e38177fd8960cd921765d9d37
font_02_sfnt_off00013981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1