Malicious PDF — malware analysis report

Static analysis result for SHA-256 5741bc14b95bb68c…

MALICIOUS

PDF

146.9 KB Created: 2021-07-08 03:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d64dda5b4e91dc31fa0220cc03ee622 SHA-1: cd4b5b27c221bfd629f0ccf3189596abd9d0c29a SHA-256: 5741bc14b95bb68cb70bb0ca4680d00ba40b4eb448fbcbe3b1906f3d265428d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to external, potentially malicious, content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://donauwell.at/userfiles/file/2482609376.pdf In PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/923fbfc2744fc9a1d43696d2bc42c82b/40109240338.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/48584642009.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16092abfb71ed6---84254271203.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3d306490d0eb3b2e6953de92b904f4e6/43467105915.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/39555044340.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7367416097---balobazobakeviwazow.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c21660c7bf50a6a63bfb0cab3d147a8b/rebugitux.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0da6ff254f---25977902257.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/77698421008.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bd576bb736b---36087711847.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/dosokuroj.pdfIn PDF document text
    • http://web68s.com/upload/files/watorulif.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/78158256789.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/95b308fc8513cbca1b13fef75d2c3715/17011754789.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7241feffc687c85bb11c29b20743af6b/12628142849.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608149829a8e5---renuwela.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9fd9436fb---17124921063.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/99293979751.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba339ecea88---jodozavumakalufubumak.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/7697354015.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/61567748449.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/83746261946.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ed34d091ca496f7e18f6a1ac3c3dbe04/muferisedasonanutegikak.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608160ddc8177---sumobenobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=win+4+resultsPDF 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_off0001e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2B3 17196 bytes
SHA-256: b53d8d9107a8192799d04047c4ab8e0d81469a368648d04ff518232a845ca88c
font_01_sfnt_off00020fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000227b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227B6 9992 bytes
SHA-256: 0d54fd6f1094c7f57ec70335a62b8f674b4a1b3a6feabadf8da8a2b200baf5d9

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