Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cfd00cc6eba848…

MALICIOUS

PDF

78.1 KB Created: 2021-09-24 04:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56bd54a86426e7784e7ffdb51d965fae SHA-1: 56868344a946f78e897b7ba4b626748d1e99a9bc SHA-256: c0cfd00cc6eba8489e59b272f7da46abfab02f80392d6d0c01396755f3f1dcf6
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://stockbauer.hu/uploads/file/sawonovojesefakevil.pdf In PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/bobani.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/45095158626.pdfIn PDF document text
    • http://halmar.info/userfiles/file/4354548797.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/96280813592.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/zamawavimonuve.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/mameguvurowujuzijijez.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/33967496274.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/57041801681.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/putetazifurawoxarutakux.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/62193560258.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/66413748650.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/fijamibiserulop.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613716b922801---suwef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd357c9256---81559954195.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/teiud3a5vlaef2hn9cvfd4nof4/10502501934.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/luvidozogegi.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/nuvogalinitusi.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/96181455439.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/tuzajotur.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/lusuxobimesitefonavuxonir.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/vaneted.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/xanewaxifolowigijeriziruz.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133c508e913e---24716039905.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///35981575763.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/fisokuferekewiler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=watch+the+secret+life+of+mrs+beeton+online+freePDF 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_off0000cb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB83 10732 bytes
SHA-256: 807e0530eb00734f69eb1cce75c1ac1eac1267aa40e3d68fa25fe5d858bac62e
font_01_sfnt_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 17588 bytes
SHA-256: 257a9c4f7e5de674d4f6e5e1f5d86befa377c1dedf4128c5e47f878a3c468ab3
font_02_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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