Malicious PDF — malware analysis report

Static analysis result for SHA-256 468199937c01ec2a…

MALICIOUS

PDF

110.9 KB Created: 2021-09-05 02:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf8feb4b6837a9ac02f304fbe8a6bc7a SHA-1: 715c55877e4219d5bdb1a12f389a4cb23fa38421 SHA-256: 468199937c01ec2a3b8573d7b442a8d901d2584d1733f208d2a117b12e32c3e1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ottopianos.nl/files/27468543918.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086901425d27---fosujoter.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/88573012751.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/revipemo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611e478220acf---remajitilikisag.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/50285954805.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/72324042121.pdfIn PDF document text
    • https://service-panev.com/userfiles/7853283850.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/panobapat.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160844dd335717---1749132319.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3a56e2db76d294ef1a199d389f23e45d/linezopumugogotugakawuvi.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/78072033970.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/694b2fc3b90cf2ad23eecb9002766c86/32383770962.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161243c33c6d97---nekikixulipixopef.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/fdd93c5e87ec1134929cd334b64bfcfd/sajovopoxifevo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbd7f0fed2---butemugofalavowuvikexared.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/78175080682.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9078ae52dbc9c0611c535a3205485934/38388568302.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/16656482417.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/17584391613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=5+definitions+of+poverty+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_off00014b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B77 19116 bytes
SHA-256: b0507093f146f72feb2f664fadeb0c6fb625ae1602372445c7197ba8f98d189c
font_01_sfnt_off00017da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000195bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195BD 10500 bytes
SHA-256: 4334e6fa091a9d1f92a0c733d6916862eae252f0066e30288bac55834ff8bf1c