Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c8a91e38a76717…

MALICIOUS

PDF

86.9 KB Created: 2021-08-12 22:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 746519da75fb5d154e6d63cc188a2cab SHA-1: 6f116c6336aa882a11eb0aff85a1a5eeee6a7733 SHA-256: e7c8a91e38a76717e78b6e6bbf4adbbf7ce5e7183d5bd956d580216db57871ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://hitpoint.tw/userfiles/file/81450436412.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/l3ptl440v9funr9209kvt4gjka/24968656638.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/75444598ba5e73e0cc891b1554989e9f/59395558744.pdfIn PDF document text
    • http://hopkim.vn/upload/files/nubagosugewokinin.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb174ee72c---23702584445.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ae18a6e4---resipovimudutojolupizofi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b88c44404f---57511923419.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/lupowuwejigaxu.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/50710333003.pdfIn PDF document text
    • http://kme-kme.cz/files/file/lefixonudamubep.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/nalevasepozodege.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c22952ba82---87826178365.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610a89a9d8137---94542596729.pdfIn PDF document text
    • https://digiconelectronics.com/media/sigixedonowim.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27081ea6ae---vipalenixuzupageti.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/52066900524.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/javefigapoxaj.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/533914cd91b9efbb75a35f12d94ab470/nijekezazigekisivegem.pdfIn PDF document text
    • https://artenika.pl/fck/file/78530011620.pdfIn PDF document text
    • http://www.asslar.de/downloads/78258288388.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/1908afe034dced53bc9e01a149cadbde/kobigo.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/445d0279bcbfa19659ebfe668083c737/43520701222.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/muzuwadanetoxexotik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hp+envy+7640+printer+server+connection+errorPDF 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_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 10748 bytes
SHA-256: b5ceab4fcc3a3391dba957ee45a168caa14dfd7993b7e53b3f6325caf7d53f38
font_01_sfnt_off000108a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 17176 bytes
SHA-256: 0ce40fc97db7a57415afd51acbf79e747e950bb927bb85a4fe81e9367701e62e

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