Malicious PDF — malware analysis report

Static analysis result for SHA-256 768fcbabdab1ff6d…

MALICIOUS

PDF

62.3 KB Created: 2021-09-11 17:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d779369d0b3cf89fd4225310d435da89 SHA-1: 3634d2100da4b638b36815ff37bd4c9d5f299e71 SHA-256: 768fcbabdab1ff6dc272e49e5de7da6000af7dfeba5e75d1e8c0c77a75f81383
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and the overall structure point to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9276

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 https://irlanc.ru/uplcv?utm_term=the+hacker+playbook+4+pdf PDF link annotation
    • https://agros.net/uploads/file/48360209014.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca0f38365b---28877112551.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/17704980668.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc618a3cc---wunile.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/kimororejozinurenikiponu.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/59918906837.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7d7feb0890946ea6c9f96f4ca5758d22/nalikujujilif.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/28962627662.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/wovaki.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/lusag.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/97245456732.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec83789f5---viwunotul.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/48691292651.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/83a0qo1mfosdo3vavijpp435j3/nuxafet.pdfIn PDF document text
    • https://simorgh.it/uploads/file/44374053490.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90de93f5d---57758717240.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/82477847735.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/wuzusujabevobimom.pdfIn PDF document text
    • https://mattress-leader.com/media/mezuwefeli.pdfIn PDF document text
    • http://topstec.com/d/files/xipodukuvakumuvob.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/34203480479.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345012d7823---relisogixelofuviramamad.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wizomexigu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6a077d41b---kovewumofewi.pdfIn PDF document text
    • 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_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 18116 bytes
SHA-256: 605b9206494cc54f491037984e882e2753f254a6bc131cabd6fb755e07ad13af

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