Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd44a62e7a57e57…

MALICIOUS

PDF

96.0 KB Created: 2021-08-30 22:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0d127cf8706cc837883ce5a97848576 SHA-1: dddf5d1a7ade9e3ca95d0c4ce9d139323a298d7a SHA-256: dbd44a62e7a57e57ca4f46ef0b20b4769032dad5f033ccf9f11218d7f290a92f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The numerous external URLs, many pointing to compromised WordPress sites, suggest a link farm designed to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=rooney+and+pogba PDF link annotation
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/p4ckt1dllf43ok62qcg9mu8cn3/losir.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/fopilekudud.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16098abf074be9---gubirodawogavimaseseji.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/15becd8ad24554f5c17c66341ac40e89/lamobepajafemevitamines.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/61984992702.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7e722bb47df49070070d7f47361f8876/64321332868.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/50627008052.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bda2ea2af---gudujakafubi.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/tepanu.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/rukijoxofudidepexiranuvis.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/98086405329.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eebe2bc54f---jiloxe.pdfIn PDF document text
    • http://inistor.com/ufiles/files/16698130906.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03e56d0c6a---19603492800.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/ritimi.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/pedelinazipusikumigurulol.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/83533333138.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/57053768209.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/33098424294.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ea1627edbc8f750f2b210a75d881dd47/24541562149.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/70551201369.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/ranilutovozupizeri.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_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 10364 bytes
SHA-256: 4163c3ebaf5cbcb5fc45937b0441193f7ce91ab4cead129b33a58c389ac14f6f
font_01_sfnt_off00012478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8A 20492 bytes
SHA-256: 6759d16e7e5c1929662a72a1b8b6f1cee2f79f4dc3c1ae1d05a50585cdc76f74

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