Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2811b01739d5124…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 04:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d75026f4ab12a56a0b4a821416354e9e SHA-1: 1dde26bbfeede59e91434c5d0e3c1c9041f9f5b6 SHA-256: d2811b01739d5124ec2491e1a54ebfa4d9bd0b71fe82d38f44c3061b406e1b6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=ultraman+legend+of+heroes+unlimited+money PDF link annotation
    • https://sieuthimaycafe.vn/uploads/file/75983729526.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/21786078845.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/17498103289.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1e611f01e---33627014029.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/49464482836.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/zewojit.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/95898290520.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/giwolejositixowavawawi.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/lomunumofuweter.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9a1f6ca32---55062756731.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/jirupujeb.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/dulepebilatoneluxepafipo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305e9f7524a---metefinisizunavuvozoleji.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109070431416563.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/nudir.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/voxenuwizulutexinib.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/55318667511.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/lilubim.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/35328591350.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210912102112145.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/xebod.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/72215383951.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_off0000d27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27C 19072 bytes
SHA-256: 02be24e5bfd38b433a8f2a6fe0af13d2d33757941119190c47dc28d15a145560
font_01_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 11020 bytes
SHA-256: fab71fb92559273e3af41489011b7a69fe2d98e871b3b9a9db24a6e1906a2f11