Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a99182cfd55df68…

MALICIOUS

PDF

89.2 KB Created: 2021-09-17 17:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90bf4f690d504b615580eb6bb14747d5 SHA-1: 714e26c888477ba31fe5834d7d4c0ffb6bb0fd9c SHA-256: 8a99182cfd55df68f0e525a84eec8d131d2a9d394def10f85511d938baf2375e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript and external links. A critical heuristic identified a 'Clipboard command execution lure,' indicating the document instructs users to interact with the command line. Several heuristics point to the document being part of a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pu-sk.com/app/templates/js/ckfinder/userfiles/files/disibabesif.pdf In PDF document text
    • https://vaynhanh365.net/contents/files/74904921273.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/xasumami.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/xafezazebenaset.pdfIn PDF document text
    • https://kawanmto.info/contents/files/renumoxu.pdfIn PDF document text
    • http://seritour.com/rsm/files/nikejizarapejupiv.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/91295460207.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/voniremuwu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd78d90bc---77910947793.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/kabolal.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77053848848.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/64922351443.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/55420384529.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/silife.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/96554783267.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614447466fcaf---jivuvosuterif.pdfIn PDF document text
    • http://pk.mo/userfiles/file/luforowepu.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/savabufutuvoxex.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/33656190806.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/67998739748.pdfIn PDF document text
    • http://fpole.ru/sadm_files/bimesiradezomo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614440139b651---monabogenogire.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/10861388589.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/bomugofinivewa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/12efaa6dc18f6c8a56129f14a17481ea/62413271641.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/24561660156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+increase+internal+memory+of+androidPDF 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_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 18064 bytes
SHA-256: 5045c1685680d1f5b22da15b05043e8db9ca300d6e08651ab4f872166fbadc3e
font_01_sfnt_off000125f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0C 10828 bytes
SHA-256: 54a87aaec7d821ab892c218121926b598bb89c9b4fc4add36761640c664a7480

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