Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e349fe4633bfc9…

MALICIOUS

PDF

110.4 KB Created: 2021-09-14 13:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86e51852a4bb7745b40cdaf2a61e9b98 SHA-1: 23f406338237916e1494f2520fcd39fdc7c3fa5b SHA-256: 85e349fe4633bfc93cfc6d86eb505606958812c93e2e7ed69d959a3510617dfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://hodinovysoused.cz/upload/file/22948313839.pdf In PDF document text
    • http://omegapizza.net/uploads/files/pigiforijivuzamatak.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161357e217585f---57771423270.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/17f87lke67j885fpv7oeaivud8/55831526315.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/gusirivirububoduzupovot.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/retotawatef.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/gemepifepovuwo.pdfIn PDF document text
    • http://chikatere.com/Upload/files/7211866483.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dedb8b3533---80913270718.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/gawivamezemeworugukeb.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/80302011788.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/jilixadonedexax.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131709b87996---telomo.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/74001243517.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/koladomixedaz.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/72634056924.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/50988014853.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210908201905.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/rewodamirosenutefed.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/pakisewoxijufasa.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/87257841052.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3159800d9177a65eb77c20d3ed569fc5/kodefibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=nonetheless+at+the+beginning+of+a+sentencePDF link annotation
    • 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_off000148a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A9 19324 bytes
SHA-256: f848213d52f2f0d49587de604c7db03b8511a11ff1842c6ebfa3c676058b5cff
font_01_sfnt_off00017b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19337 10632 bytes
SHA-256: 81f93e77e623ba8c4cbfc624a649294e4ebaf0c46aa2c959460502141b37e4b4