Malicious PDF — malware analysis report

Static analysis result for SHA-256 2affb0b52636a43e…

MALICIOUS

PDF

85.8 KB Created: 2021-07-05 21:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8a979c96fd1ff4a041f5a39f16d93b62 SHA-1: a7aa7405ac9fcdef75ef6624cc03b51d8778f686 SHA-256: 2affb0b52636a43e3e74590fc057d06e6e54e58fa7818b9c46b8b503f8756df0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae07db3ccc6---lizinaxur.pdf In PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12df9e598a---sizowup.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b6c51fa4---80043704453.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/ponimujumugitazada.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/44065431730.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab51ea4b226---vamadovebafeluj.pdfIn PDF document text
    • http://soles2walk.cz/data/file/10029069348.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/8908167264.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60e5d0ea7---92394885712.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4865d322be880c3a8e2fecc26590945d/16358051561.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/zipasivitinipulimavaj.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/56194672525.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6c84c448b8ee52a7ec3c54b7cae4ed0a/sabazuru.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c284366c1cd---tuvijorasamolate.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n8j0ffgcrfrrlv868qvnb6ighc/sigigari.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/60064576478.pdfIn PDF document text
    • http://thedreams.cz/files/jebozekisegeke.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a643c56567---vitaz.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ccf7eea04221c3de0f9a3c64f90f7179/71127012931.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/70527795904.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/41b43c52a288124a56e050de5cf473c3/421364816.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d189410f---sosenapufokufuv.pdfIn PDF document text
    • http://jarosi.hu/files/file/vuwegosadanebof.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/emug9ob1viaj1q7dlabktoak94/77158779624.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/narop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=2021+ford+mustang+ecoboost+fastbackPDF 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_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 17460 bytes
SHA-256: 5e8616b5304d0fa0851a55ad06b5af2f86b4a96a7b608b8437dca97a0cc08822
font_02_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 11212 bytes
SHA-256: 6f3dc16e01527ab98634690775608d94fb6e2c8d9bbcfed6b176b36f0c95b34e