Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c898f6b9e3cae8c…

MALICIOUS

PDF

72.0 KB Created: 2021-09-01 02:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ccbff81ae9f89452198cd8af22fba108 SHA-1: 92b1ad3f7ebb4d879e346d90db0199819fe05adc SHA-256: 8c898f6b9e3cae8c18056326db6d7a81bee15af1389980ff03df420ebddf8845
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting suggests an attempt to redirect users to malicious content. The primary attack pattern involves luring users through a seemingly legitimate document to a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/19082298753.pdf In PDF document text
    • http://liebherr-tr.com/userfiles/file/delatuxefifiz.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/jelisizikukot.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/pesatonijopukit.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/24208056922.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/loxonupejuveduri.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/998u06fuddahfvhkg0hd7tddf6/xubuloronukodogepegima.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/75776589953.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a28c1d2858b5db4ae8a7b712c6e2d489/80648985970.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607791a3166cb---19705639932.pdfIn PDF document text
    • http://chikatere.com/Upload/files/24665859049.pdfIn PDF document text
    • http://goref.ru/files/file/15311357851.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9865fe17243649040e8c1a251049dc14/wuvexe.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/novexifanuvupiruxurixuba.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c0de8f2e78a10380c30890ee311b87b8/gofizepagisuxip.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/18012429536.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb5ec28a09cd1e9d07126547a8acdaf8/83203311668.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/15595450719.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/fb3fc780e0300c4b34248bcd2dbc1a72/gibokikonuzogunivagetuz.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/puzolopemadoser.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/fodijiwoz.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/fanig.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/13562564359.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807dfd3b630---97016886576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=biot+and+fourier+numberPDF 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_off0000bad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD8 15280 bytes
SHA-256: 0bfc8c701353cda5e44bba3f72881d798d297869c11e220cc8801c40e6541852
font_01_sfnt_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 10592 bytes
SHA-256: 3853cf0641b9611cc5d35a1275826c8a91365357a19ce6d9365b007a6045dad1
font_02_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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