Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f7a36e0b38ccba…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 18:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c01e1273b55a1f80d43f9d3b41c81505 SHA-1: ff61f028bd473aa8cfade9209424a1248a1b5419 SHA-256: 68f7a36e0b38ccba8a807dab84e2c7cf27e081f430786e28fad6a1768dc82867
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this analysis.

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 http://reversetheclocknow.com/ckfinder/userfiles/files/gemusufodebadusuxitera.pdf In PDF document text
    • http://bamila.vn/luutru/files/25960325140.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/piselojopudosamu.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210817_034727.pdfIn PDF document text
    • http://chikatere.com/Upload/files/raratojadesagevivuzu.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/pipurewikeruwefej.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-16/20210516030640914886.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/95531737442.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/e40gj7t1o86ccgbnhphoe823s7/92410021982.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d9c2a474---zurulinukaxudaje.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/xukolu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a704515ee07---22996974219.pdfIn PDF document text
    • http://newo.ru/files/files/62885036537.pdfIn PDF document text
    • https://actor-conseil.com/files/file/54442635184.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210630044847032.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e8b56d14---fulavivel.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/dolunikomomopegasukepetiz.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/76608537199.pdfIn PDF document text
    • http://hrudolf.com/userfiles/xatamik.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc643856a71---padivavi.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/wuxemonixuzozividijo.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/51258803265.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/89156455418.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k7q3g4650cn3g1729ms0umfo56/42915325460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fr%C3%B6hliche+weihnacht+%C3%BCberall+pdfPDF 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_off0000b78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 16644 bytes
SHA-256: 1ccd7bd9f639ccbb9c2afa50382969c842df38f99250aa36a143d3ddb0626fe0
font_02_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 11036 bytes
SHA-256: 2a547912a8828dada74d955f33eb0bee80df6bb7e1fa3891aba4dae705587401