Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6e387b63bfc9e4…

MALICIOUS

PDF

89.8 KB Created: 2021-09-14 18:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc3c5b1c4f943893da96cbc9a2885b2a SHA-1: 1804fa61eca78d08908bdf98844d8343199c986f SHA-256: 0d6e387b63bfc9e491b6bb4a156c6cd38b8281f7294394ed8be31568b95e818d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various websites, including those hosted on compromised WordPress installations and disposable domains, under the guise of providing free downloads. The embedded URLs suggest a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=kamasutra+pdf+free+download PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/67ef30e19f7097d99a25ffd7e33ffc41/vekozitenegidalozaxutoz.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/88362638545.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/jowuwevuxexu.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/luguxopaxubelinurivu.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613010551f7da---sasosorefobirodirazudasu.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/xajuroronaxidibalukow.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/judofeveg.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/23401062201.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/rexadifafugamid.pdfIn PDF document text
    • https://phuquiland.com/upload/files/lewavopafibuvomejevigumo.pdfIn PDF document text
    • https://partetesal.ir/data/file/23568974084.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/virijolukasemodime.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/23143016273.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/ledowigaxo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/9e159e3cf1b58358b99eb9ba1f6d3453/navezug.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-8/20210908025046911285.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/rediri.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/morupusefofukan.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/wefopomam.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613163060ec5b---pafatubezisipovedi.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/ketobelojuxufuxenemexe.pdfIn PDF document text
    • 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_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 10744 bytes
SHA-256: ecf0ae1f29ecad4f4e6b1a5b986f3bc481a8e8939955c74d62691256832d7951
font_02_sfnt_off0001222d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222D 21380 bytes
SHA-256: 6eff11c524526ac1693021d5d1ddc84771b36adb316d4fdd25a8b9ef8fe691e0