Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d709b2415489bd3…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 23:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e73f9b0a9e431abb55c6722f923ccc9 SHA-1: c7be58a53a06e7b3bc71ee07075621f8fb4afcc4 SHA-256: 4d709b2415489bd3f2531d1ae0de7fcdcec9875038619db3523ed7109c81ff2f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://winso.tw/userfiles/file/poxul.pdf In PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dfe55260a---jokirusenarenatuleratol.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a44a122265---biwupeba.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/nulabaradolasokagir.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/r5ekq6pjpnmcdqeb5pbtou0pa1/mexofug.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a316fc2457f---dujanulorerujojed.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/416541e02a46d4284d46f12a10bc0b8d/38387933038.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/saduvaz.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e9b02c4e5f1d6b36a9ec29de80454b32/3894110667.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/88e89cf0f6e4697d181d7fb312a50291/21192213126.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099373bbcacf---jilikimilemovoj.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/u80dh4spcv1nsg6rcmeqfd0un4/41959010123.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/3j1lkrec8o5pvf0mpjh7fmr89a/40084172185.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/fe8760044efcf81d10d7baf8ffdc85e6/zagamogelavodajen.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e70805010---voxuvegokujamaserus.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f32e3bc5d2---jutinidan.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/04oe8hl3o8s326srofs3ku8kct/zijujamidefodamubimer.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/40276107744.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216182327591223.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/57895228352.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b035dd14bbe4d5183d936a9d3e2322c2/jawigotojodajuxotufabo.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/50784229327.pdfIn PDF document text
    • https://afayl.com/userfiles/file/51941223471.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/923287915af28bdb30efe6cb8abbb313/mipasowapefep.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160818966ea8a6---mipilun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ascension+meaning+spiritualityPDF 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_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 10912 bytes
SHA-256: fbe4523b4b04cbc0cf0418d885d6e14dc621fbc6f667c76feef91b439aa28f64
font_01_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 17232 bytes
SHA-256: 0d454d33f0f5add9224482ff2ccd13d2fd67db9d8b31fba0abc9f67e61b6f754
font_02_sfnt_off000133fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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