Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdd54c8caa42550…

MALICIOUS

PDF

76.7 KB Created: 2021-09-10 00:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ce257079357522ac1272da24f301e80 SHA-1: e0c92f3af8baf8ffe24ce71c2b86e21949d2dcc4 SHA-256: 6fdd54c8caa42550de548d6a605aa23305cffbd842a610957f53240a7a3f900e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of external URIs and link farms suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://jinwoosmc.com/userfiles/file/pavaj.pdf In PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/vumazemofodet.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/57a7a3d67198d50ae404359ca8b48a33/vabagu.pdfIn PDF document text
    • https://lecachet.fr/docs/files/21444739716.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/52818390185.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210901_BC8A99550080619A.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/13056110607.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/babuf.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/65442764970.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///78686508753.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139f078746a3---somopulanogugufedisadisun.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132601328962---kadan.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7vaqfv34tc9d1anmiu84l207dj/durilowibokibivosikewe.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/60465743725.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/javopavolajelepule.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/gitalibuzuvejagexodisox.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/panidif.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1febea81d---82345240468.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/jalaxugitinisir.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/gapoxefefiragoxopujog.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/wekokudakun.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/lefapafapanizogono.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f559d35135---zenibumopilujojogadomilo.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/54714515788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=amateur+surgeon+2+apkPDF 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_off0000c82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82B 10752 bytes
SHA-256: 4f1554d81f2d5f84cd0e7b08053f0239add0017366b8244f2a031f0f439ae219
font_01_sfnt_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 17276 bytes
SHA-256: fb628df4d4ece76e982df22a5bcf3a854e4c523e4c100f16cb23b3acdb237d3a
font_02_sfnt_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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