Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca78188b3ca6fd0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 07:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51d5c059c64dae08e9faafa94180d204 SHA-1: bae3d4b3716f0eeebd8f161d49017bfae3190001 SHA-256: 2ca78188b3ca6fd06fb5d7d1ed81bb4df2f76e2eee80a360f70ae6df3d06865c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=shooting+nerve+pain+in+arm PDF link annotation
    • http://vinhthuanvietnam.com/upload/files/xizojaxatafakupoxego.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/wegivinefevovagiw.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323969017a0---divekagivid.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/buvonipigiwo.pdfIn PDF document text
    • http://identik.hu/editor_up/samoxu.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/kowuwa.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/62240764921.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/25768912963.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/54180386121.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/97618678467.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/97175087931.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/69345243510.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/40171357722.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/kejef.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/7559305269.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/11258901490.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/89718906332.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/12209464887.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/jedagumexek.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/5eb77515f68c17ff5c884e43d94e35a4/maluwebefiradok.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/94064197546.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359a209ad49---tinoraxokebaw.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/belafe.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/56823088856.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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 10624 bytes
SHA-256: 49b89fbf4ee68bcad34a439c80d34817c70eeac6746e9f976e507dd81df622fd
font_01_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 16624 bytes
SHA-256: 884df5b1e25406893f18f88534c60b444ff544147780820bf2bba9df0ce9fef2
font_02_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1