Malicious PDF — malware analysis report

Static analysis result for SHA-256 8debddf2988c2225…

MALICIOUS

PDF

126.6 KB Created: 2021-07-01 20:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80341c603d1ef0da210282ff82b11ff5 SHA-1: 15cb55e96a942ed4935c29cde1ff427d7f5101f0 SHA-256: 8debddf2988c2225db89d43d1e82b345850736831794f193bd6ef7a81972020c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, designed to redirect users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

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 http://dobrasekacka.cz/userfiles/file/5784800444.pdf In PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/n78p6gtm5okma34spusodqb7j1/51501985749.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974a3934c56---zuxuzujezosixije.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917fc34055b---65038479803.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6359648c3756a14b79e667c1a4575881/61078717574.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3d59396fce4af8dcebed9e2c2a3ae80c/63993353680.pdfIn PDF document text
    • https://aedwea.com/upload/foto/bakajufejaniwar.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/cc795abddea18c9adc2e14054441334e/xudijimazemek.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/pajuguzewarif.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/74913941050.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d812fc8928---wagavoxovabugevazewuke.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/984dd9d2805ccbc5b774f7de29949026/tijog.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lsetnhmotm3r342jcqlla5rgb3/23175440135.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a4a0ef3b40d0178de7fe01dd832f019b/66809635306.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/urcjc3khlpaka33gf4iuaggo98/sesobalenofixilejum.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/16463137806.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/78627805018.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/47186197211.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/51198932202.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/79340273608.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/kituzogavoposefopur.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070956a9c576---72107983711.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0302108d2---rudipokosenolosumalen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cortisol+levels+and+sleepPDF 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_off00018ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A700 10480 bytes
SHA-256: a0a792934fd0bb9868805385bb73368ca70f138ba3373aee8393dcf2afd0ccc1
font_02_sfnt_off0001beee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEEE 17728 bytes
SHA-256: bd9c0855b1a60c70d04954f6278fa917172f01d033292aac4418e84214c8633d

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