Malicious PDF — malware analysis report

Static analysis result for SHA-256 74162df0936754d8…

MALICIOUS

PDF

117.0 KB Created: 2021-09-04 18:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c83326d0f1c1c5bcc763fe1c26d667e6 SHA-1: 07955a102dbf3cd21a1a487a4fb4142675280273 SHA-256: 74162df0936754d8ed2a46ec159e6c99671ebb4061b43303406d4ab9792b6d4d
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable domains, which is a common tactic for phishing or distributing further malware. The presence of numerous links, including those pointing to compromised CMS uploads and disposable hosting, strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://apexnepaltravel.com/userfiles/file/doxufokolevegelidepesud.pdf In PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcabca9a296---xapobisusoxapit.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7f1bd7f2---6375336379.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4ef9223ed14b46a0347921ab9dffbf7c/gosujamununofuvipoxefod.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/17350387038.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/denek.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26d1fbe8b6---sawelixegukore.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/7938359793.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608197b3e6553---jatoto.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/utiqkjoc15f8as9q98lsl8g5j2/barinabaxixosokamunisa.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f7efcfc12---17972657457.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/rutizufek.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/c23545c46a668547092917695f84f7c9/zotixobefetu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161209f2533a5f---64901407762.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f4bcf2aba---11956011602.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/dulokaz.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d4120c41bfac3af2f4dd62983225b9a0/27173219259.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/67420360584.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/86594767412.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/57202000939.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ead305b367c5131d3fc5825ac8ec8263/94202035795.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610e629a1e152---zixupemafevujez.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160888f8fdf98e---5158208776.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/sunixifaxekuketivi.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210902142313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=submit+vat+return+manuallyPDF 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_off000161e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000179fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179FD 10476 bytes
SHA-256: 15e44282dce4d34f49b41c31d4798d9d76ed59bf281e328fc249e9d011dba41d
font_02_sfnt_off000191cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191CC 20576 bytes
SHA-256: f6e47fc2d2d89837ccc48fed7ba23324e6a683c58956a11eaf65ab029196a1e9