Malicious PDF — malware analysis report

Static analysis result for SHA-256 8396f6422b29fee4…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 10:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9fd86dd3567d66dfd52868e2183b282 SHA-1: 757f7fb5b6865319ac2896201590df904fb18d5f SHA-256: 8396f6422b29fee45b0968136e132a5352b2f46c71a2dcefc77570fc3734aff6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads. The document body is heavily obfuscated, but the presence of numerous external links suggests the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7434

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://yildizwebpaket.com/calisma2/files/uploads/jokugofepij.pdf In PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/735c72e7290c99569487c7d13cf2fa45/mexabal.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878387b118a---bemevelisabap.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/37482460193.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ph1o447tloj40cjgfgor49a3mi/75148466885.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210725/file/16272270634077.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1640f1634665d9a8cfd29330f27c2de1/gosugegisetomuperal.pdfIn PDF document text
    • http://winso.tw/userfiles/file/44252580060.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/33b758c01e75625f36eb04876dd60cfe/kirazod.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/xikunenosulijukuge.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/22985582559.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/20928814965.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a96f197ea7---vavatipexad.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/80547072527.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/fub692g5mj2k93i4876qb85p7f/tanotujazaxazalejiloz.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe0a8228b5---12704327869.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/vavomujabasibuxuzawara.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/makebunirixuxovanatuwoje.pdfIn PDF document text
    • http://ashioke.com/images/library/File/xaxuwebemiwa.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/zitexokovugiputo.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/gitatot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=vax+steam+cleaner+instruction+manualPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/75a4b94d287c834acf415e5f75fb97d2/9834116965.pdfIn 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_off0000d571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 16864 bytes
SHA-256: 9c8c9711005c0469fdd94034283f67e48199d96abd3aca062050ba4875631f56
font_02_sfnt_off0001196b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196B 10564 bytes
SHA-256: e9fcacb50fd2383c5e3d235e23e45c87fd8404aa8d22255562570e0bca6113cc