Malicious PDF — malware analysis report

Static analysis result for SHA-256 68264f0a92264516…

MALICIOUS

PDF

89.0 KB Created: 2021-08-05 20:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 752c7b3288c63bef6b3506743a77e319 SHA-1: 9ecefa1f8c38a60651be00f8b76fe91b3854e8a9 SHA-256: 68264f0a92264516e11944389aa647e48a37da9941b92d692c2a9efd91eca49e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to compromised WordPress sites. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous links to potentially malicious domains suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ecac8b16504---74225756084.pdf In PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/16683253234.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/94225168342.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///guxedevapijanesufajulif.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489d286741---jawisenojebodonabisoxuka.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/22973841904.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/akj8ltd28b2mbt6ia19s590shv/79412634783.pdfIn PDF document text
    • https://agatanorek.com/files/file/64378708360.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d8d22cbd2---81974175545.pdfIn PDF document text
    • https://esz.jp/img/editor/files/pukoxilidid.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/e68sn1udrv7qsv7rscae4jsnl6/55222479938.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/16149178130.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/tuputo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096854b85ea0---95598287272.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/wotomimekazinev.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4af9d6fc4---fumodikuvaveragolepiz.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/j48h9aragtl6klum5kj57giaum/bofulufeviwafodazumus.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/vadizanibilu.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/41836562916.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/fdb4181cad33522f0f9fcb2fcd0eaa53/29068073579.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/38765983315.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a6051cf9d6380eaeb18e02e06b682fbc/99039537018.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/97590583678.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607113380cdaa---56142726287.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/zanus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+are+the+three+main+causes+of+urbanisation+in+indonesiaPDF 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_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 17532 bytes
SHA-256: 1ed2a976d744414cf667ba58cbb1cd438e8c602ff417cf915849287203bc0e63
font_01_sfnt_off0001231a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 10928 bytes
SHA-256: f8ecee71c5f2d31ad40ad67fe1d5315a51d4194b423e39f42c7f758af42d0fac
font_02_sfnt_off00013c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1