Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62c81d4b08e7cb8…

MALICIOUS

PDF

73.2 KB Created: 2021-08-28 10:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 39cb8a35884dd0c23bfc1def6e4abf21 SHA-1: 6643af25efaae9f304ba0294bb604b53dde576a8 SHA-256: c62c81d4b08e7cb89cc7e69f11ebbe8ab9cf7033825a0e29827111988dd7fe67
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF files hosted on compromised WordPress uploads further indicates a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://teyadegitimvideo.com/calisma2/files/uploads/6462964900.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d03beca6---womevuvumudat.pdfIn PDF document text
    • https://castel.ro/userfiles/file/98584381323.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070d636b9155---muwababuzizoli.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/kinetej.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/44562143042.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126dc5785e97---75328144426.pdfIn PDF document text
    • https://latework.cz/soubory/63449253779.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/116b3cb5ee5354971233b1bddc72dd4e/45396067352.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/bamutelopufudew.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817072eed84---xokezedezo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607914a58e34a---21756980258.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dab6c8e258f9e0d74bc9b85fe17a076e/61725406605.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/63874578824.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/dda86f08v7g3d6crtlbvgfuf52/wejagolopa.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/muzewilamufokojibi.pdfIn PDF document text
    • http://fxlcd.com/upload/file/gijedofidatoxawibafevuku.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/15092745941.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/tosakapurepubaw.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/66716971073.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/5740676191.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/be51fe06e0495430bc66ce15b608f5a0/dadew.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/115718240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=factor+tree+of+35PDF 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_off0000bef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF3 15816 bytes
SHA-256: 4cf72fcb25cba3a5e8dbfbda51741ae94ce9af08858d19f74ce87373d07ca3bc
font_01_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 10204 bytes
SHA-256: b34fc4c891886527d9f1edc54cc90652acc0e75fda0680001fd9385b7ab322fc
font_02_sfnt_off0000fe93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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