Malicious PDF — malware analysis report

Static analysis result for SHA-256 230cd1a27beedef5…

MALICIOUS

PDF

79.5 KB Created: 2021-07-01 15:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f68092351c5524b6bab1c1969ec21439 SHA-1: b7900eeee7e8a638d5c18b7b3dfaf0538f3746b1 SHA-256: 230cd1a27beedef5367fd64911f97006578ba21c6b87969081ba8d49417502de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage locations. These links likely serve as a lure to download further malicious payloads, masquerading as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d23bb93c8a---16852394564.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5de02e0c44---78452818697.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5afd35e99---tajelural.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a0fbb2e13b6cee50bf7d9e8421fd07fc/pegesewom.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/44b0ead0aa2b323bb29e940d963c7340/87104296026.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8088dde88---visepokaxijisoxowuxedo.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/96895155917.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/xozevegijogelalabufifinot.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/21e6f8153e8347974e0e954a8a33814f/xutudero.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/pakupu.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/jofejutilasopowi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c915e3233fd---8834213620.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/62774874144.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6557aecfcead511801fa35a167c97ddf/posogubulilefofawajunif.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4461ef3447d64c9d387fa870db977d28/xezoxadupesux.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/1iu07m11tmugsmvv88mn0ahj24/watekomemafirodorazewuris.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d0c10871---nejolonuzegubajum.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/804d1f9b2e1d73bf5d471cf41e19ef78/bobafovixavofeped.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502005630587742.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf96fe9071---mawotumez.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e24a282d1---fegigelonezak.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/95766215157.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/832afbc9be8689a2a64994fba2ae64c6/98311284845.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/gewubetaxaruwer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=formal+operational+stage+of+developmentPDF 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_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 16568 bytes
SHA-256: 8e6995522690e25f99cfffb2239b34f28a0c825af6fb6ddc0af4022104d95f90
font_02_sfnt_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 10884 bytes
SHA-256: f59ad9afb59599834ead1641dc550b22d1664d5c559a7a3eb0385f6790bc03c4