Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1a7882897618db…

MALICIOUS

PDF

79.0 KB Created: 2021-08-31 11:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cf9ad064dd31f05bb4c1c26c1972071 SHA-1: 9f4bfe256fa788a968dd00d251b4895367b4fa09 SHA-256: bb1a7882897618dbfc97b8f9a6ff25d0838d018ac47f90887f7320489b273d04
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=how+to+draw+a+table+in+word PDF link annotation
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c0eed3ac6f7863e8158e8dc525eb49ac/zukusuwezogupe.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/10303989374.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35a63cf30---ragoxukujeguze.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae479b2541c---13863785580.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/73492306948.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/96132519665.pdfIn PDF document text
    • http://allasclub.com/campannas/file/46025936092.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612bb7a196834---fafevoxisosetixa.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161262a36a4647---wopaf.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/zajikugiximemejakepatexuw.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/pasurosodexojuxuravon.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/wufimodewuligetupobelimik.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/abe5243bbd18ac3f01df923de3ad5191/vesapomosakiwenugafuwe.pdfIn PDF document text
    • http://orem.mn/uploads/files/88565950469.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/27890386136.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/38099856000.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef69314dd8---8819437222.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612926cfe4afe---letaluvanetifofo.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_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 10292 bytes
SHA-256: b6500d3f5cc693b21c2f50618d8a3856a7e111525d7dfef23a7d7480584540bf
font_01_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 16464 bytes
SHA-256: 6446bfe7c5f5e17287a53fdd23580c4d29f2bfb8f61943b253b9f4f15278478c
font_02_sfnt_off000115c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1