Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc818498b65f1fcb…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 23:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90ce9acfdd5bb96fcd48f63138bbdbe8 SHA-1: 9d7c12818cef05437cf2b28740cc67c8b6442d64 SHA-256: fc818498b65f1fcbce7398a48898f7a3c9c820c5d469d546f0d1909c658793cd
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://curry-box-deluxe.de/userfiles/file/89330028861.pdf In PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/kegakeke.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609197bcb6d90---2609161333.pdfIn PDF document text
    • http://wohntraumgmbh.at/gebupogufu.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/nokolawepetogojibovil.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/javojodej.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021717182159416.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/zegovika.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/814f164f6523c23d235bb3a1954f4f75/38326207052.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/3993607380.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/alogqp50vguerbf6gj00d757r1/41939517667.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160901770381dc---pijegepevexovatanabo.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/reremomimavu.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/kiruzixupevu.pdfIn PDF document text
    • http://www.bash.cl/media/file/94985466185.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d502d05923---93754945738.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca28aa5f58d---37814011338.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/zidefogiroladaw.pdfIn PDF document text
    • http://benrassam.com/uploads/files/98495627049.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/58703713149.pdfIn PDF document text
    • http://cjatkinson.com/userimages/19083094698.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/88egrfrenrg298jb61jrfnc0ps/94716184669.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vixanabijikim.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82bb087265---37648744300.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/jubejixifemojetozuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+beatles+get+back+2020PDF 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_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 18660 bytes
SHA-256: 0746abef54bdf7a60e2fe4a8a1403ed917812457b4d0673d72524740fc9d83d9
font_02_sfnt_off0001301f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301F 10528 bytes
SHA-256: 97ee5524c60fbd9658ccc953a4b7434c1c1356bdde1c6bfcbae43cc4e9a5dc77