Malicious PDF — malware analysis report

Static analysis result for SHA-256 739939945845d063…

MALICIOUS

PDF

77.0 KB Created: 2021-08-01 17:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1b9bfce2da69770c91bf5f05109e9c9 SHA-1: ea294cbc8a6c7b821b60a90e696cad7438415ed9 SHA-256: 739939945845d063432be40fbb2b0518d16d303ec4e591f91d80a4a35eecb10b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The primary attack pattern involves luring users through a malicious attachment to a network of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/f9bdeb62b4abf2e6289f4d709f8fb4db/jeveti.pdf In PDF document text
    • http://paliukenas.lt/i/File/buvumapikop.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/18fmvsokh16ttcat01fsnrifp5/doroxa.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/1532953090.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/buligerunebafijilonetowez.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/63616413525.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/uecemjuk04mmh2i3ab3clne6e6/lufologigegupexivesa.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6083c0e89c---kivoxuvudazijiwejat.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/masune.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/14803519525.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/fulisudivarefifezalona.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l9ngpd14fsvjhc2alt7rrb8a8h/xibobitorije.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/tugakubazepalexebaduzo.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/pokopeje.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/kb7dft6ubv8q2dfnoq8mqjp2h7/17195471043.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/jukagobap.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b365de8c75---44700144510.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cda8ab0cc9---9567667477.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210623064520.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/batoviboju.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607581f85769e---mixijoxe.pdfIn PDF document text
    • http://vanhoadautu.vn/static/uploads/editor/files/geratojujog.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4f65c14a56bc1b971b6bb5287b98e2ed/pakilumotezisafiwekov.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///75367164110.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/tatenovulupedugodikak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=street+dance+of+china+2020+ep+1+eng+subPDF 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_off0000c8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F5 11464 bytes
SHA-256: cc23c731bc14b055a821acfa4d9187c807c764451ce899e49614d3fcaa113735
font_01_sfnt_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 16448 bytes
SHA-256: c2d923a65f83e5a90e09b9f4bd4a3f91efd9d92293aaac613efcde22f8b3774c
font_02_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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