Malicious PDF — malware analysis report

Static analysis result for SHA-256 7149eb0689abe5fc…

MALICIOUS

PDF

72.2 KB Created: 2021-08-07 02:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1fe9a1ac1ecb330506464a1ecc119275 SHA-1: 59cc6d280369411efffad682cb3320793cb47f53 SHA-256: 7149eb0689abe5fcb70d19c94ae07286d1697f2286c8d013b2aefdd82ca7f2da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pensiunea-escape.ro/ckfinder/userfiles/files/6445484232.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086d18356d6a---57852537986.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a853b0cdc7a---lisaluzawuw.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f7d2450ca25af9a2032545780c3150e9/dusezudij.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/57934912933.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/29896368067.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/15038940608.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/71757771221.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dd6b6f9ed5b743cab53c45b15fcce6e9/50882141329.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/pazomidifi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/60d5a576adfee3e8aed0f787ba0d070a/mofajekalivawilemupiwa.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a8ddcfb0b---lifogorubazizijalox.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/vujeperavabalulexebemu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1tq3g1vkbq49dnavct0aisgbk5/kurodelavajidefudakot.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51025149656.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/pimerewibubalod.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/42356798073.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/3m1ub1cqv6r2opkbo7682or3br/76458174002.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/kijonabuvogubokumiwutuna.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/tisipozam.pdfIn PDF document text
    • https://t2sc.me/userfiles/65572915779.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/vemuponemurasudonurosej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+percentile+in+map+testingPDF 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_off0000ba28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA28 15868 bytes
SHA-256: 465cde12829c2de9f2aeb271dad98d76d265ac6af57e1459437cfff3ff8d6793
font_01_sfnt_off0000e2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 10696 bytes
SHA-256: 9a4da24722c0addfcc7785491638032b67d91388ac579ba7c8f0b1f23e51c181
font_02_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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