Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7aca70c901dd93…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 14:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a5cdec010ae8985c2b15517ebf5fe4e SHA-1: 3e54a2ac5b892f1d470e18191d0a640e96cd7188 SHA-256: ad7aca70c901dd9382c207938ce80bf61e76cf899addd574e8d2dd0d2b02c88b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://guijek.com/userfiles/file/39580755002.pdf In PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ahe0auemnmks3euhfp05lgsgg2/zevipelofimikomisovif.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdb6578501---nolerigu.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/xawojudovarek.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e622683d7f2---xugepake.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/85795579734.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/netavimesusubokinosutupo.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/18312913469.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d20eccf0d31f7db5ff3beb5d66767c9f/46371573942.pdfIn PDF document text
    • http://berbun.com/user_img/file/39152106344.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9214b1a04ac5dddb43f8b03d2f4916cd/tatijimarotopujewupinonor.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/zefivusoji.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d3c78779---kelod.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/78254101053.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/fonemevedeto.pdfIn PDF document text
    • https://vientangluc.com/upload/files/bekuzobixepew.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/geloguzesixepolimugij.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/bozugelebeg.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/23043506295.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/waxuviralanewibamopokaxi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19221e5e1---5352530426.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d34135bf2a48c22e631a74a6294f5972/rafilemi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/470ba1e1542d87defb0e6c266e7cb8ce/94452709306.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/34554734126.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/19384206245.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c921b6123---76629479920.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/91376206995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=characteristics+of+risc+and+cisc+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_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 10704 bytes
SHA-256: df3dbc7bdc2739f5c97566d686ad61070a2e848903eefdbfd7c54345ed64cd5a
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 16528 bytes
SHA-256: 840d4fe12a5ff4f21223cb84b2296fae555a3b7b90bf5c35471319a1b97a3fd6