Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6215f4509f8df3…

MALICIOUS

PDF

94.9 KB Created: 2021-09-03 11:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71d0e2a9fd8596913868d2d9c23af281 SHA-1: 486977ad347bc0a8dba3a597ea2c0bfde8c25479 SHA-256: df6215f4509f8df3290d4e5267eeb087a76802aebfb66a95d8b1376565067aaf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files, many hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or engage in phishing. The structure suggests a tactic to bypass initial detection by hosting the actual malicious content on external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.alfapilates.pl/upload/file/kudesewanesivav.pdf In PDF document text
    • http://aygroupmuh.com/image/files/20843665016.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2494722e4da7d16d70fc381ab2114f80/fasakubalo.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/88d5dbb434dcbbf275c4623e7124437e/9627860098.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/jobimuwetukepajebefiro.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23b5fa423c---91177072201.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/pabavokokoligorelireg.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/77014062376.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/2770532206.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/xeboli.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/57029147863.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aba7005e50---89775321616.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/99231268846.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/nejafoge.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/sunixexovagiriki.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eca7abdeb---48991595271.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/80796669181.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/lijaviwekiwizamig.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/zigaxerovukefut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077620480641---24039928978.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/xedubamevuxapotutena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=appendicitis+etiology+pdfPDF 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_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 17996 bytes
SHA-256: 8582f97ba5f5fee0df5543c00061096d3c3dad6d41310393281aab1a6c279053
font_01_sfnt_off00013e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E21 10628 bytes
SHA-256: 059a224a2dada71a03df5d450ad39f3f98e217714f7f2e9833c8236d90291b13
font_02_sfnt_off00015661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.