Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab88b06b20480d9…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 03:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e05258831156037ec16500287aa727f SHA-1: dc9464e7a31f8e7e00f8d2dcf84a222c14f4de3c SHA-256: 0ab88b06b20480d9feaf070cea13f5fb445f82131e4c627d282fa14ee9dffcfb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://brette-animation.com/userfiles/file/mowujuko.pdf In PDF document text
    • http://www.moyekolodin.com/files/korax.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ibt1i9jdnum3lbar8nh7q2dhrj/werezunuzozatuveridid.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/27546203254.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/gqhstkeglqfaqq33i276eb5t76/tasubunif.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/demitagajama.pdfIn PDF document text
    • https://granitnet.hu/editor_up/tevirizubixawodepuxelid.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/36541331353.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/lowedotejotudoj.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/sekepafokoderodipeleziwo.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/rawusudisanujusifapafo.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/musuvavowavonalifol.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4a3d92bf---9181370967.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210922024419.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tilowafiletemejegeranub.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210903_AC8A1C3B059A81E9.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109210951092735.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef60c44855---94168183514.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/rebedotuxutowet.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614da96bc9723---58225763775.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/30898409405.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/falazenirarevozuvijewobu.pdfIn PDF document text
    • http://lactopad.com/uploads/files/ledalufumadapi.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/17265083935.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149e8774ae27---21920001476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gta+5+online+play+now+free+pcPDF 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_off0000b528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB528 15352 bytes
SHA-256: 2ac6f719e3b112ff272a7a60b98b069629acae4967c57d6b026dc1948ada8b4d
font_01_sfnt_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 10676 bytes
SHA-256: 87a316450905827436ea5967fb0bae8ac4e0be2e00017eea0155acd783b82b16

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