Malicious PDF — malware analysis report

Static analysis result for SHA-256 d796d27b2f2adb5c…

MALICIOUS

PDF

92.0 KB Created: 2021-09-22 23:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7362c5dcbdd290da0b646be3c006c35b SHA-1: 9381d05c5c01309fb0ad9f6a71e96cdd39ec221c SHA-256: d796d27b2f2adb5caa2a0ee82c380c4da5e398faa6d8fe377b112748820e9dca
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage or appear to be disposable. The primary purpose seems to be directing users to download potentially harmful files from these external locations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://vytvarnyobchod.cz/UserFiles/File/sufasewafenepori.pdf In PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/soposegisava.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109100713033918.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/ninubixarosesusorajuk.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/xavimuj.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/suloladubevekazinuxun.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/60086955030.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1e2f2476942341fd8251822f6f00b502/nilumivikovibosubuva.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/86071397068.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/25109947704.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/zegiwin.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161457e0db5c72---90497229635.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6a5635e5e---55240969217.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sjunpqhm4jpqs301c4ne2opu2s/sasonetuwetuvavepimujuz.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/54950861587.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/xuwokebugikabuvu.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/juvugizi.pdfIn PDF document text
    • http://airmon.hu/images/files/55813286917.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/55347335779.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/60902096876.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/24567498550.pdfIn PDF document text
    • http://hingliltd.com/userfiles/28839836419.pdfIn PDF document text
    • http://boardmark.com/files/file/6510916927.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/guxanonikone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+ultra+sun+and+moon+game+download+for+androidPDF 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_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11338 10976 bytes
SHA-256: 52fc0ede61d15b4d74e5dcb94cbcbabb23ec748799fe799e91f439ebdc8bab4e
font_02_sfnt_off00012c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 20308 bytes
SHA-256: e8175c2d5ce45edbba22039421e87912e356f739f97015db34a30d867cb32826