Malicious PDF — malware analysis report

Static analysis result for SHA-256 242d17f9f2a436c1…

MALICIOUS

PDF

78.7 KB Created: 2021-09-10 23:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4264dc89399d3b75ce6c9927a785f45f SHA-1: ccced5c233aa879bb4ce94d4cecd9c994f05aaa7 SHA-256: 242d17f9f2a436c12cc2a81df1b7aa26fb0a987b3cbb6ee656db6706b946c0eb
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. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation, suggesting an attempt to exploit users by leading them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7432

Heuristics 5

  • 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
  • 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://njuhome.pl/ckfinder/userfiles/files/60355394364.pdf In PDF document text
    • https://sunnyrosesschool.com/userfiles/file/jerebewuna.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/jusefaritifovovixugati.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/21802361301.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161342136ecd58---sogogebojevolipezidaji.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/75922601956.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/40302229385.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/66942192054.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/wizefaf.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/xewudimisosasuluxobase.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/54519845487.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/rapubesid.pdfIn PDF document text
    • http://wenxuezj.com/images/File/29899442785.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/482b7f55baf376985f33ed916f674358/31569995568.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/2309062302.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/84622063368.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/xalediluzotixofax.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/84346194263.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/a9ldt140vjm9pabm7k3one7dsf/57435909336.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/22377503512.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/lavuxim.pdfIn PDF document text
    • http://www.grifin.sk/files/87715586599.pdfIn PDF document text
    • https://ewt.cz/res/file/85864577222.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/vapunakidajusorexizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=short+story+in+bengali+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 11104 bytes
SHA-256: 42796c7159c8d29c8c4a2f622bb2f3ff7d8e66566879e344aa9970979fef7951