Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e7b50f7abe7df3…

MALICIOUS

PDF

89.8 KB Created: 2021-07-23 13:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 43286ff491d978a5e5fbea57365e0dfc SHA-1: 6e80f910940dc5589c0bf0ac6c8f3a0e67b4e664 SHA-256: c6e7b50f7abe7df3574f042d9aaf61744f22895fccf141d368f3cd10989cf0ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous potentially compromised or disposable hosting sites, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' firings. The primary goal appears to be directing users to external resources, likely for phishing or malware delivery, aligning with a spearphishing attachment tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://numen-wow.com/userfiles/cloud//files/belisifidewugoxumom.pdf In PDF document text
    • http://hangtatmj.com/userfiles/43363320356.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/50778819140.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b257812b5a---nugubi.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/45758613006.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07a25cad7---vemujufikatidewisajogurud.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/liratetufuwufepubene.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cca39701c4684c435c2e49d9d5463438/85110102615.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/j85hkqri6qhje6shht9qgld3pe/6007653164.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ohbvshv97pd7sram8gjcn3mp01/tufofitilajevali.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/kobuzudabopudiru.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/wokod.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//tomexidu.pdfIn PDF document text
    • http://kalikraft.com/images/file/87911746624.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/72432988249.pdfIn PDF document text
    • http://strandedtattoo.net/file/6122023007.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b3crhgbbvqevl19ti4htaji799/fobaniveposej.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/34ab438aaf2515dea67894c99f54dd9f/79223154979.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/529a7e5c72b1bad6a7591f4540e009fe/fesebe.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/76266690242.pdfIn PDF document text
    • http://darec.sk/files/files/70612179128.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/eausgj0pn2geljva857ct7o4d8/90605309954.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/i9per0q9huipsk6uq8tb9psou7/95822063857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=reheating+poached+eggsPDF 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_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 10692 bytes
SHA-256: 61788961a3f4eafcf786166cb96daf8235a517e1659dd017f17150311c1face5
font_01_sfnt_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 17060 bytes
SHA-256: ba6d14fc55b2ce6bdc60972d06099fb70d78cdd792d16c3ed7ba3dbf078c7cb5
font_02_sfnt_off00014138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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