Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15416ac8c6e0b8b…

MALICIOUS

PDF

84.9 KB Created: 2021-08-15 09:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47d37d80bd72d8b9032e95e86900cbd7 SHA-1: ad4c2162fe0b4520b8e7c986e51e312a90877fa4 SHA-256: c15416ac8c6e0b8b14a1e8043b091c371caa53c19479b86cbf4511e18aefc1b2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=cease+and+desist+letter+slander+canada PDF link annotation
    • http://growlink.biz/userfiles/file/pazunimarezewepew.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/jalanoxozega.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/rulosiwafe.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/pituz.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/fevepitefetatu.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/78367734876.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/62994786649.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5v4tmnamki5u59ndnogsf4val5/21710863930.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/galogisuxoru.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/buduvago.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/xutulu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/17ba0ce6fdf98e3a9a8dfb4bad411893/96255758618.pdfIn PDF document text
    • http://abnicum.com/files/file/62694178914.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/gapufizususifoxu.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2qtton8qdadj9u464nrg0q1b89/35368931570.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/98390457158.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/66217975196.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0612fb95ce83938505b203ab56f12cc2/9642717093.pdfIn PDF document text
    • https://artenika.pl/fck/file/sukogizesejalugimoxos.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/aha0ktndhsou5o7a7h9rk7sp86/53154127949.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7e0f04658---28441562347.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/97950817997.pdfIn PDF document text
    • 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_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 16820 bytes
SHA-256: b4de019a1b2901f3e02cfbc3d46390efd2577de2eaacd81cc67aa3f919ff56b5
font_01_sfnt_off00011465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11465 10272 bytes
SHA-256: 11eab38a55e2a03adc30a01a71a12af729eca77ed8d5cdd11ec84e62f2766273
font_02_sfnt_off00012b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1