Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49a50557a5c65ff…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 01:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20d218da8c1edae1d5a0fc1042e9501f SHA-1: bb4a3f5668a5613c90e52a7e460dd84f4c4d29da SHA-256: a49a50557a5c65ffa7c6118891ca2ed2ec1e5f3e7c2cd7c8b90f98e84b7fb082
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/55b4ldc7kfqld3vru9tnsd7bfb/gomofavad.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0ed362461e4169202ab3a82cce0197e9/18829924910.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607411f902929---80157760932.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/53e2ee7937d6edffbfba0e4136d27d10/famus.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160779d7202190---75484897551.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021082619510043.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/62e94ddu4sc18r40g2ffs6rnde/4452675193.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/vavusipebazero.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/tazulatanefosewobipitosub.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/48443774154.pdfIn PDF document text
    • https://medius.sk/userfiles/file/76147733020.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/58018672650.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160828984cfc00---doxumugunoxemixajepi.pdfIn PDF document text
    • http://aimic.com/userfiles/file/53199686003.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/ruguf.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/rq1kcg8csmrrbo8tqfofjf0vi2/72892888595.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/xukosupupekijokoladuj.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb5d7c0b56---55383041551.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/lawalexaruzejitawamokewu.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/12603d9ef36d4d23cd85ba7594cabc57/javomulaxitedeboxuzipad.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c50c78a9e---57023254605.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12548938203.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6f801e679f5df780eab76990c33db4aa/malowafagukeda.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/34440685947.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/8792906290.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/33629985193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=party+in+my+dorm+mod+apk+latest+versionPDF 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_off0000cb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0E 17512 bytes
SHA-256: ea69251b7a9ff60016f90bc7c441880f7220937346cad404e88663f3c7103a3c
font_01_sfnt_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 10828 bytes
SHA-256: c4535d49653b8450b12bcad1fe1795561fbce65eb56771257dcbdbc3d2950a22