Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47855c36818f9d0…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 09:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01cad28e5ac68a2982cd0fe05596c5c9 SHA-1: 723df7246a2529a9948a14158a58f85523bd27d0 SHA-256: c47855c36818f9d061810c2899bdf0e256dd4983d632bb8d56c827b34d01dd6e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crownprolaw.cn/userfiles/Proj_Name//files/20152122488.pdf In PDF document text
    • https://coevent.ru/upload/files/rezepanunisaguv.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/45822293046.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/12566529778.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cv3odct94qaconfvf089395uq/45544492839.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/74546036236.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/guzozavovefarilafate.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/zawewili.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608128ce4c44b---gotevifijarigidid.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/ziwatoxonasekaparusad.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/negaxel.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160d049ed570cb---sodel.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/27361004960.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/dimafebelamefazogite.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a68bf2eb895---fefegipi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af969f96995---81522439567.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/66505931136.pdfIn PDF document text
    • http://zimmerei-possert.at/zipanilafatu.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf66f0113de---melejimigelelowaxik.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/jagigipofulepumesux.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/29768839451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=anti+inflammatory+diet+for+arthritis+pdfPDF 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_off0000ccab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAB 10860 bytes
SHA-256: 3c6f2dc43ad6cd25f5917319c58763b2982ae1cd984c2cc1e420965f606bd20b
font_01_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 17416 bytes
SHA-256: aa3d4dc5cbca55f3d324c0a7a2b4c999f4a713d75bc89a9604f8b490131781b5
font_02_sfnt_off00011292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1