Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea599a705affa28…

MALICIOUS

PDF

88.6 KB Created: 2021-07-30 21:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5be364805c9d163a732115000be5185 SHA-1: 7aedd83917073f5450f86783c96f189a8e6e7eaf SHA-256: 8ea599a705affa28440f4d38a4ef16fe7e4f4598dd66486ece948af60004efdf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the heuristic firings point to a URL-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609121d43270c---napemosiwevax.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8a1431be---35162963604.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/371ccfb465c74c2c6a998338704b3526/todefozadatitida.pdf
    • http://bethanybaptistcolumbus.org/clients/75549/File/45328407321.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/957a8ef1f0fbfbb73c9a2f6d022af2fa/45619547007.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607129f212dc7---zetewisafabak.pdf
    • https://ambulatorioveterinariosismondi.eu/file/10018854194.pdf
    • http://bukharageorgia.com/sites/default/files/file/48247592364.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6e2b5f55f228c691c2e4ea93fac7ed16/nuwafozitewotufoninixega.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2fc28685dc4d45ee2123937497cc1d6c/waninanimukitedep.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/2bcf758ad0e919e86fda407cfb40d959/dazalawudokixute.pdf
    • http://epoetryworld.com/clients/53741/File/junerejumemigomifinebo.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608456c67c533---polilimodikul.pdf
    • https://netshopnepal.com/userfiles/file/25251831172.pdf
    • http://splogservice.ru/content/file/nisoxikudeselu.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b940f54c---lafugajopukilakur.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/q6bv5shvv1454egbqk62pdf4k3/fagimozazokejevise.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gb0694l48qlafpl83ituhpff4e/jidagilavulipuva.pdf
    • http://aromaonly1.com/yamituki-n/uploads/files/60598420507.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/028fe4cb576bbd5421e4c85e8023f21c/29851668589.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/06bca100a58f0106b992658ee45b48f2/6386017361.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bfe901f96---52233988248.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/2da5f8c4f5f3931702ade81624fd2bec/27652643413.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ostc4rrp65gtksmfll354c28u7/jesumozekugokulov.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4d57f658cb952bdd3b7c0a070f4df3b7/nepuvo.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/janupalejiri.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+makes+a+good+sugar+baby+profile
    • 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_off0000f418.bin
7f310d11873a371f1eb000d7de7d5b1937d9098e81a8203b430ac35e7b15e101
pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 17532 bytes
font_01_sfnt_off00012254.bin
ca89c217dd529462f38710513d47c6857f38f98d00e839f5b33f362f9269e036
pdf-font-stream PDF embedded font (sfnt) at offset 0x12254 11280 bytes
font_02_sfnt_off00013c6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6C 16792 bytes