Malicious PDF — malware analysis report

Static analysis result for SHA-256 55251265d9f33d8c…

MALICIOUS

PDF

90.5 KB Created: 2021-07-09 12:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b1eaf9b3a2dd2f6c1e97b3dfab310ecc SHA-1: d5b5bbe12ab4bdac6d031d7c3979202e9af194f6 SHA-256: 55251265d9f33d8c1cc56f1273fed8f8a86e17d0267f70ef8dd8071d3bfbc782
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=i+could+be+a+smack+freak PDF link annotation
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af0d0c87646---62585380870.pdfIn PDF document text
    • http://kaies.cn/upfiles/210705035616406003s9ufom.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160746be570b29---91394820728.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/8545d0fb8d49a7c58aa571f92fa1df6a/30152748657.pdfIn PDF document text
    • http://fittbike.hu/files/file/3224375036.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/64511192414.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/1397847454.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42d199fa9---bigiresatejozibaj.pdfIn PDF document text
    • http://medrea.ru/upload/files/86101589763.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18992c5cba58b77af5d06a4fa31d89a3/42310961936.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b92f61814a---88599414161.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/77308265956.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e2ef19a58278cd8087df0cb29ffd58a6/kokawezepirerin.pdfIn PDF document text
    • https://luminex.pl/upload/file/lojigafakifu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/95657594505.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/vujuviwonomedupiba.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e4c819c3491b65abc1e3467293d943ae/xejavap.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/63801895140.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/ninez.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/mezekox.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d012ddba3---15471775973.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd10d96b421---muluduse.pdfIn PDF document text
    • https://yuss.itfile/gavobunujowemumemu.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_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 17080 bytes
SHA-256: d4f6a2030df032faa6dcd311ddddae235b0d2876250f9fb8c52d79deb396a429
font_01_sfnt_off00012cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAD 10628 bytes
SHA-256: 5bed952420dfd1d100facde0c9b327012b9a97509c22350d7f2b25b451fe8811
font_02_sfnt_off00014501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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