Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a6b8f7311f8738…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 19:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 28e251190b68dc7d4fa7679ae85870b2 SHA-1: 9d219e5ba6b9de5d0f3912b4590d6d27af4c87e6 SHA-256: e7a6b8f7311f8738062eb4600131204ece812986a7da59567253eec594e62379
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting domains. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/unrjh7is5dp8bl9gpnbq72t80c/mirubisejasefur.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6fc46525fba547e08bd3fa314003dcc9/divanetikozosi.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/kixupagejakuki.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210905075611.pdfIn PDF document text
    • http://cichanski.com/Upload/file/mopovowepixijufarewoseri.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/zatuzarek.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e378abc36---11894270971.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/sijebasosodudozurepuvif.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/falekotovezafotutupono.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/53350797005.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/muwijixenenifebewovebazu.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/jevidof.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6cf94b74---34247949650.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/nalupizopom.pdfIn PDF document text
    • http://friulanapanini.com/images/file/girufilaxopataw.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/75271798712.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/ponid.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5208caac9a21136cb8a9a1c2167ebee0/febuvaxitamam.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/pisurojuxipufisoted.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/kojisisubugedukotojesas.pdfIn PDF document text
    • http://guitarenko.fr/img/files/vifobajezatojima.pdfIn PDF document text
    • https://0900107678.com/upload/file/rosupawenifitatenefogex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=shape+face+haircutPDF 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_off0000e0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 10312 bytes
SHA-256: b8829ed7d45a15bf42bc30d94e4fff23191fa2e14bb438e750d878dcd4493ad0
font_01_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 18272 bytes
SHA-256: 5570bbe90eda5bdc73433c5873b2b16d25d25be1faa15322af0d9d4ddf3cd919
font_02_sfnt_off000126fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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