Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8b05b30245bf41…

MALICIOUS

PDF

76.5 KB Created: 2021-09-03 07:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3877404971849e589b30ac00f06dd33 SHA-1: 24ace462eeeba756f0508e00f1c075dc8d1d587c SHA-256: 6c8b05b30245bf417c86b114a22b1825722658cb27340ae59be41ab8f6aae324
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gdwtechnology.com/fckeditor/file/99322828417.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc41e175c5---24680072075.pdfIn PDF document text
    • http://altinay-law.com/images/file/wimupovagoponok.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/sowipenasimubufajagaliz.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/10849230052.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/wuwogim.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ec51a932fa017929d1d81dda0b00159b/23870819321.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e69a00e4ec---fedulejufemade.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/be823db4894963148368971439fdfc9b/xuvimagavekekidomew.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc3cc6c0a---feranugepo.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/soredukebupo.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/dovudabusolez.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/zafamaf.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e99031ae0---28883836395.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c4614cdc3af1447ba0bdb34ba9bc50b2/dojipopedubebuzezagar.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/94941397067.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e7589c6fb962769b660b2e51f63cbbb7/76571718744.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/71356426464.pdfIn PDF document text
    • https://fallsplat.se/file/rufaloragexorerefetowari.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/25371231842.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ebf00e77592e642f9ffcaca827d83274/jepesanupagadewujowuja.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/suwaromazitabubopup.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b2661ffff---vemasizakalef.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/53968458252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+sketchnote+handbook+pdf+free+downloadPDF 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_off0000c546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC546 17544 bytes
SHA-256: aef0c3755b80c1324da922c1dde0297d6b000a0d63093cf146823076c3965c5b
font_01_sfnt_off0000f2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 10904 bytes
SHA-256: 0b9da3fda70f9694ca4b73e4e074b19e6433a998ab87c6b7a440bd18fab3c380
font_02_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1