Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30334a65167767d…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 11:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af456fe8d6fc11b7bf8eef6e4ff266ae SHA-1: 9db8896348b80ab39c2ecc472adb26ac3773ed10 SHA-256: c30334a65167767dfc16ee26e0cad598140d49459d7981146d1d2e8e668bec51
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites. These links appear to be part of a link farm designed to redirect users to other malicious PDFs, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160757fdb6d8f4---befujow.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c93b0edfc2320b07bd9a68aefb87e138/sopunobax.pdf
    • https://beautyyaurient.com/editor_upload/file/44300673381.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/21d10960b5f64f80b433a246347e07ab/33630277161.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/vqas60ht460pm4o67ue3rgh2l1/japizazotep.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6b8497db38884cf952fdb4a31f8f92d5/wululujepopejojates.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/7jddtkrqoaqntn9o432h1am5qi/46177502785.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/vanepage.pdf
    • https://abeess.com/userfiles/file/67106322849.pdf
    • http://baaningdoi.com/file_media/file_image/file/44207715300.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9f28a80a0---37308951850.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b8802dbba42408fffa82e4386ccb8795/84297307836.pdf
    • http://sibinetweek.ru/userfiles/file/86213847759.pdf
    • http://mega-stainlesssteel.com/uploads/image/files/towelovopa.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/aveh9b69ncleqen46q91fglijs/46132795925.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9e79313e---vadumujet.pdf
    • https://alzubidi.com/userfiles/files/tukexosetutupaket.pdf
    • http://ceskylakros.cz/userfiles/file/41145240741.pdf
    • http://busangh.com/attfile/fckimg/file///202106171890_405330325.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e73723209---90355555904.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071903a505ff---88942629086.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/nodudasu.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89789135b---18685279908.pdf
    • https://netwindowvn.com/uploads/userfiles/file/sekalawimewitajikaxoz.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cd38cddd04fbdf0548a7ae9f1dded22/buzaxixizotexofur.pdf
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/97369715790.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=unit+operation+in+food+and+agricultural+processing+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f161.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 16792 bytes
font_01_sfnt_off00010973.bin
f6bacfa8cfa920ef52d0ddeb860bcbca7a41881a934bcc244cd0520274a3d04a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 18060 bytes
font_02_sfnt_off00013901.bin
394dd573f8f11f8f656c1d6dc30ada4875ce109d08ef053c3b5b3ae197e3a8cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13901 10904 bytes