Malicious PDF — malware analysis report

Static analysis result for SHA-256 5524adeb6104cd41…

MALICIOUS

PDF

75.1 KB Created: 2021-07-03 03:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 702068da94271be94120b21a94202285 SHA-1: 662587ff6a216cdc0303c4a573db4396c170d1de SHA-256: 5524adeb6104cd4193e68e386cb040de1d6396d9878a0111e3d9f220c91ed734
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS uploads or disposable domains. This suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7451

Heuristics 5

  • 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
  • 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://hasekei.jp/userfiles/file/pajofijuloladolususef.pdf In PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608075d0ed395---fexurobegon.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/tetekemijugen.pdfIn PDF document text
    • https://aspirans.com/files/file/59324196474.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8341d646287c4b799988af9b99403cf0/zuwarage.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/82342295821.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/59582647768.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/86465107122.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/rupus.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/83186f19e28d73ed1fac7419d7c10a0b/sakipub.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/33193331160d3a5a1c8343.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607032f1d217c---55253370002.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/63829179423.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a67fccb8ead---diniberosunibisizew.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/88453470807.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3f5a91eaf---99183144204.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75e166bf88---guzefi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a1b39a441f3071528269df2934b384c8/xosexipafefakazizaxi.pdfIn PDF document text
    • https://mmszke.hu/files/file/54730665972.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b806666cab9---xoxufixigarurugukuwubav.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/vebojilemiwotowumelovizuk.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/todasubavibaxomigebaf.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/eaf759312b74a26147c32b6199666de7/32973990716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=non+shedding+dogs+for+adoption+near+mePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 16660 bytes
SHA-256: ed471162a3027de4ce55eb0359ee7f01855ec421545f02af52a54178e0179776

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