Malicious PDF — malware analysis report

Static analysis result for SHA-256 826841232c75308d…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 20:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a208532770982bfaa65cfbbe2751d6da SHA-1: de5e74d3430a41e33edfa416d480905d3e86ecfd SHA-256: 826841232c75308d0fb41e145ee1c630699278b588c189c295c67e1eb52c66f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that redirect to various domains, many of which are associated with compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cructi.ru/uplcv?utm_term=thoptv+app+new PDF link annotation
    • https://mayxaydungthienlong.com/uploads/files/files/fikexoke.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/79264408414.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/zopetopujufoduwupotol.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vllcs5k4k7r77m2ohrpd9qd3jq/repazapexilos.pdfIn PDF document text
    • http://santeh.md/img/files/71302005337.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/6805195476.pdfIn PDF document text
    • https://people11people.gr/uploads/File/6549321841.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/pukijaramijenofubok.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/68777193917.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/87016290049.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/86621599556.pdfIn PDF document text
    • http://airzo.net/userData/board/file/jixofuwebejuwesa.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2fa2f210---xabatofexop.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e60cf9313d---zamobojane.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091006181073499.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/wedamafixebotid.pdfIn PDF document text
    • http://xenangheli.vn/public/files/418266438.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/daserebasefogoreginu.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/97715358870.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210911_006626DFD6328F7B.pdfIn PDF document text
    • http://belovosushi.ru/files/riwuzexuxutixuxusojibari.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/vajutijumejokowirag.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/5b6c318k2p2a26dd45al21lsq8/43571112295.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e6a9df88521933b981e02d706694c62e/sikipexuludebul.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16143f373c6cd7---44924615002.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/berimovadokosafewalojaf.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/32842300829.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_off0000c132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC132 16636 bytes
SHA-256: dfb50ce48f178570201f30bfded86a8eddebb7dfcc1ce9fa463b39689339a11a
font_01_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 10060 bytes
SHA-256: c9864fbf1ed651934c34c32f2985bbf0e2d77761c416cda1247acf34389539fa
font_02_sfnt_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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