Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3971a44c436cfb…

MALICIOUS

PDF

100.2 KB Created: 2021-09-22 17:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b5f41abf1f88510be88631fd21b9d93 SHA-1: 09d61164f4c5d38d28e3ed828a82fa1dd52e1893 SHA-256: ca3971a44c436cfb14a928be4c000e65faab8abd83d9ca00a495008da5c20711
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is designed to host a collection of links, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://inwebjor.ru/uplcv?utm_term=once+upon+a+time+in+china+full+movie PDF link annotation
    • http://kelkenaghshband.com/app/webroot/img/files/vabixogowokexowo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142117976e89---xitesinupolowusazotapufuj.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/vovixufegar.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/vefubejajoxa.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488e16afe1e---fidixanupenufigagifagev.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/labovot.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161351417a0f8c---sepurixazirizinukoviko.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/jakoxikufokusebat.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/juxav.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/rotalaxatikudalapavif.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/sikujolatezatagakofe.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/xepuxeretetivezagemo.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/sifurubifebi.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f907d907---derewuxuwovijulamupuwi.pdfIn PDF document text
    • https://esz.jp/img/editor/files/61394624112.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/luxufiweruriduxupux.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/96466512089.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/9804836937.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/1154216471.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0b71c842---sipavax.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/napogawijune.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/93185388380.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/lomazedevago.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461aca1add8---42217014576.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/62709413066.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/somikebek.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_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 18936 bytes
SHA-256: f74c20920fa6e5e8c05c1f3c497e9918918348985cd4c9fee49ebd9ee8bf67f8
font_01_sfnt_off000152d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AED 10668 bytes
SHA-256: 753a3bee99badde6b82578e735f87dd6c0421d0923d2dfa93cb3b417b4fc279f

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