Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8cc4c72f7cbccd…

MALICIOUS

PDF

116.0 KB Created: 2021-06-30 19:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2869f49735c9785b085da109034bebb SHA-1: dfd2f1693fe5560bb8502c248a0f9e698c531fbb SHA-256: 3a8cc4c72f7cbccd0d430e24113fa942055044e30b2d9b30605b740869698c1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=extroverted+personality+definition PDF link annotation
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4997106347.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/81955495274.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebb8c3135---pigejupufodobudeveg.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6f04331d7---miredufovikede.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/midisima.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b481b806d05---18493503569.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/pafuko.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/0327040275.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/rcpvbuj1n5edon2ruume098on0/22225905539.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/38625435269.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/jkn9l5o45deuruo8ksgh71r02q/jirunokumawilixijedux.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a442799d88---vikidawuwapo.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/34367002335.pdfIn PDF document text
    • http://vodnik48.ru/content/file/33456991327.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da66dcfcd0---lirebagakolewotoseguvinep.pdfIn PDF document text
    • https://bio86.net/fichiers/wiviko.pdfIn PDF document text
    • https://kristinanamaste.eu/files/tazufebugibofod.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/91b04cc09faf23e8b5fcb90ffdab1313/joxezemalaro.pdfIn PDF document text
    • https://istanajp2.com/contents//files/pejomilevom.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607917b1591a4---73488259051.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/22626230193.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/tinorodasexusemaliwa.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/a4b229ad89da3a5b29469fbb85b80c16/rupulapolumakutube.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9l4mgdfcg7tfs5qpvu681n8aas/wasidetejupinitapazafafij.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_off00016381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16381 10756 bytes
SHA-256: 5fddceeb5031cba69854c662f123f28737895ee62898244b3dde76db2f1069c0
font_01_sfnt_off00017c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C65 17732 bytes
SHA-256: 1bd70e0ecda876eaeb3145ca7ca0942d217bccbe1d84af968707016ca858b645
font_02_sfnt_off0001aac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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