Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0d232e51a3aeb0…

MALICIOUS

PDF

85.3 KB Created: 2021-07-25 23:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: dfe68840e086e23628de34b69be23ebc SHA-1: 5233f127abacdea1d8f995b3edd3c51d6f098818 SHA-256: 8f0d232e51a3aeb024d6e72c73ba42251699184e943d6efc68eaa68e862898b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to external content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://stallion-international.com/userfiles/file/jewitutorurupufutifupuz.pdf In PDF document text
    • http://ccforum.kr/uploads/file/1627025808.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/3477564082.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/kiwaviwitesunawige.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/beb113b51a9ef83ea29e53e3daa28659/sinotibinu.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/65014008607.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/sivutedalolupitiza.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/6674078466.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/76576609126.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tjlumc6lmrcgpo9np6io0f1kec/momikawuletuwemidefiwipeg.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074243c124c4---tajizosokufebapudulimo.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/5474050922.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/nuxodomafurufutajalese.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/fobizuruponanuborimudiweb.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d3ef0682---92045809704.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1997767b7a5500d4c91dfa169cfbab00/7641495615.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b728d05f9be---jarajodixamizatovodikir.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/61b22e0aaf6c2beb822a2217ae3dcd7f/61112548545.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0856391c8b---xibozonogesunajizafo.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/57501678618.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf8c4e932b---kurodasanefosebapar.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/75721302543.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/nikukexofapud.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/13298891036.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/16699603297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ashrae+handbook+pdf+freePDF 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_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 10572 bytes
SHA-256: 22d5f2104d1520b12ab200ace4490a34643df904d67d718b6cbe65a3bb281577
font_01_sfnt_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 17360 bytes
SHA-256: acc92cfc745cf533b12ee3afcb23fdf3d93bf1c309b10dbc36cd6c2b55a2e6bf