Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3b322fe1b1ffe7…

MALICIOUS

PDF

77.4 KB Created: 2021-05-24 08:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9d1c061f68d301d56d82f904b35a62f9 SHA-1: 8899ee8aaedae575935d04d22fa0486e894e9f44 SHA-256: 0a3b322fe1b1ffe7847486e87964f61592ff0b2ce0d7c6cd08af59ca6e50b02e
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c34c8691aa---kijopeputoxurizobera.pdf In PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/09a409d7bbf7f19c1cc8ea7ab65bc7df/gadirubetedefosilosewobuk.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6fbd81a3a---benima.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ia2jd9o9ne279a6t5vo1cmq0po/44693559816.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/57dj78p7s43fnse0340cdp4djo/migidusunobagide.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/434707217.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1460843bc99b277855ec9d2470c9c493/46614692447.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/pumezip.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a02b2fc6be9---xuretosubabeg.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/141e50815f2d3b079001ebf324998c3a/28735862607.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098ea900af36---25496428389.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad098015f---wurupoxoziwefemafeladi.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/79378748340.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t1r7vs0th0okt1rn96mr1qm9jj/73813342128.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-4/20210504090521123197.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/6glm68k6ntsni2lbsmg2jdg5ce/25763783972.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/55048483501.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=partituras+para+piano+iniciantes+pdf+gr%25C3%25A1tisPDF 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://scripts.sil.org/OFLIn 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_off0000d782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD782 5524 bytes
SHA-256: 4040d131d9fa8b30bdb0940c414b5c11e41c9811c695d529b4ab0920dc76492b
font_01_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 12648 bytes
SHA-256: ac0671dc002a5d8d0bcd154124bb97e12e04ffa0bd6f4508a2763668a9fa3f94
font_02_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 16240 bytes
SHA-256: 6a3d208364c87ac40ac9e131b4d5aa63aa3c52279da9a4b789417ab1a4bc180d