Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbb464a3bbfb30f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-08 01:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e8838c80e99183c01d64e8704c31e1e SHA-1: d4df2df74e5fe5ae876292885ac9fd76a82cc15d SHA-256: acbb464a3bbfb30fe8e65acd76bc9e3fe38d9e7c61a8d1e0fadcf320d1449293
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://inwebjor.ru/uplcv?utm_term=reduce+pdf+size+to+1mb+free PDF link annotation
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a98065a0cc250e1937275d589e5fc8a2/sovum.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/xukezosoxinora.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c0d6fe8c8798dfdc8740ba5f66a3d257/97897942115.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/67037269692.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a375385dd1---solekofapazugorarexulak.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c603e004cc7---55385528787.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8d9358990---gazemasolonimotorux.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609adc4137f5e---40877184118.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/jaxazobajelogabijusa.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/nedevivexofav.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/puxigazim.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/80130481877.pdfIn PDF document text
    • http://falerisztika.hu/tmp/wexumizadi.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/widixutofaxigulazavufok.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/34310597667.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/zadedorisufezizapadodile.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/ramutasegujipetanerolafux.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1e3119f5---40070193054.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/pawilemet.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/bopodogumatexolaposid.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/27793455786.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/hvuvvgungji8bd69j865m1lvll/1173135716.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/25025441684.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_off0000cd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD35 18284 bytes
SHA-256: 14ef6350c18a4e2cbfc270b9c1114863444e6bb2de337b422d23f2fa45f5f2b6
font_01_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 10868 bytes
SHA-256: efdd41b1d583a88abf2f40d186f31e3af84d963788ee1e7f97b0ae9ba4c5c693
font_02_sfnt_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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