Malicious PDF — malware analysis report

Static analysis result for SHA-256 1503cc86799a1432…

MALICIOUS

PDF

76.5 KB Created: 2021-09-08 02:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40f1dd21dec223e8f9efca34dc885ac8 SHA-1: 550bbc587d43456e76217551e0461166c1c93d42 SHA-256: 1503cc86799a1432878c972f734db0ae501c66ea79ab3facf94192d8a8530deb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ocw.tw/uploads/files/jotupoxiranuletazefixip.pdf In PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d0a7fbf62e5ae7b36c184dfc2515c7ed/mekoxora.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/97554194203.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/89392647338.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2b2dfea1bb1e91c3bd5bcb144e4a11a6/95630513758.pdfIn PDF document text
    • http://vhz.cz/user-files/53425492534.pdfIn PDF document text
    • https://blugarden.eu/file/donaladewuroxi.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/gusegabofozimekepeku.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073ab4dd1ddc---59257405203.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96e0f2b41---gowukuziw.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/669b8f045d5bb15a09a1239d765187be/nujesumolidezijok.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kitinobuvupipita.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/73244873101.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea40a921ea---57054419582.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/fusamalowumefidulu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/9efd4f2fcab19d2eac278959b7fab826/xebexemufikojixasemup.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/tiwosakedotovoxig.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3a3e27570f6e59d63cb80efa36260220/57407828845.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_213827_9641.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/sadiko.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd85a38a851---74860543276.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874fcf9c18c---35323675446.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/94427190133.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/3a0f4fe3f1b3fb573a39a54c6a63e212/vozogowet.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8d016df96b71f2795e87df0de13d7e17/balobezarunanutax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=konosuba+ln+vol+11+pdfPDF 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_off0000c117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 19780 bytes
SHA-256: b98b38bc1b25b89cced5537f485f3d3116dd7db4905b08f5da161f7081f9619a
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 10416 bytes
SHA-256: 134b44d90045ea6212f94a48547efddf4b9947f4519d1c319e24a39fb8b49a22
font_02_sfnt_off00010c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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