Malicious PDF — malware analysis report

Static analysis result for SHA-256 e171745d49322ba5…

MALICIOUS

PDF

92.6 KB Created: 2021-09-13 10:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f70bf252e7b23ae50b057a32d6d0f87a SHA-1: 385a621f4ee078543e8e984a0d61914c721c0f95 SHA-256: e171745d49322ba5d0f543068b091bc3c7984adba61f44b0457aa2d166f38ef4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=watch+deadpool+2+123 PDF link annotation
    • http://ventmetal.ru/userfiles/files/2904372863.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/74670325559.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/60619063992.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/43996507941.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e793d75e1a---wubenimulot.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/meguwosifemak.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/66250441539.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/69315439246.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/62388659122.pdfIn PDF document text
    • https://ms02bet.com/contents/files/zugizusuriminewojudumef.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/suvetesapamubofulubosej.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/nazakazivux.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/77a7696be48351581d06d1b2afd5592e/zowabisegi.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/zeligopexedozinipiz.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/doxamafirusipanukili.pdfIn PDF document text
    • http://apcmagon.com/userfiles/17709101531.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/4585828751.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/bixivexibedezasaporazinun.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2fe99996---35323374376.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/warokobamidudunelup.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/bulisilofodapewob.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_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 10484 bytes
SHA-256: f187e93d9e5ca3dc451bbf0dd3d117700cce0af023c5bb0ccf38f53d1e71cc2d
font_02_sfnt_off000134ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 18716 bytes
SHA-256: 1628d443a5d71983efc6c3051cb3985654a68c844566750fa7125bd2927810b7