Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64534f3f43aeace…

MALICIOUS

PDF

80.0 KB Created: 2021-09-26 02:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: dba161d556c81b3dc830f71c7cc2a894 SHA-1: d92a8192a8106c3864d5b5d2938eaab7eb31e00f SHA-256: d64534f3f43aeacec92fcbbb759d0f7a0555fab5f1d8fb32eb0f9c81bf7cc7ab
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=sword+art+online+light+novel+pdf+download PDF link annotation
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wijosukokamafejepemela.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614692b039ec0---22067778232.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/94278098562.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5c8b6c93---14218176012.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/10308318155.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/kalujixepedajawajapapun.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/71606266196.pdfIn PDF document text
    • http://imoroz.by/upload/file/rojatudevukazu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c686a7b5b---zozidokopokinuwasunanum.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/77910747538.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/48595704136.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/fapem.pdfIn PDF document text
    • https://polaria.cz/images/file/butimupo.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/gegerevudoniv.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614002aa832e7---94060802379.pdfIn PDF document text
    • https://baglab.pl/galeria/file/duponager.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/sofezawik.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/pojolatutiderumo.pdfIn PDF document text
    • https://webhosting4.net/media/file/45048152852.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/25408071995.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/24975875244.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/2566672845.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pm1uleoie0luolbig2tmfbqku0/devizeredewigubopajepofi.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/vajemojafebolufire.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/xepativobigisab.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/zelibagewipozelugitoz.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/92167326961.pdfIn PDF document text
    • 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_off0000c915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC915 21400 bytes
SHA-256: 3dd7e80a79e9125b7a6e8bb9c65d5ec091de0eea2b166b9bc3499f83085538cf
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 10836 bytes
SHA-256: 09929d6c5016d69a8896a554474b35e67c521086ed9d0c3051beb12128d76473

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