Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b755a5d1dabd38…

MALICIOUS

PDF

76.7 KB Created: 2021-09-03 00:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15294b4067107c623574632ea7c994a8 SHA-1: 1669de19816ed52848040d6f48be84556140a471 SHA-256: d9b755a5d1dabd38fb0d0ff81a4aa57299156fa29efc4a429d19d0f5b836a6ce
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://gangwonbnb.com/FileData/ckfinder/files/20210813_D05ABFC6455BC61E.pdf In PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/59633133661.pdfIn PDF document text
    • https://italvaping.com/file/69845087090.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/tovowugevup.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210614_A011E0DE397408DC.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3d2e71faaf6bbb78ffb6f65c68388480/jedejiziwiborif.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/suxarifegosaru.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc78cacf60e---33540534839.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/889b86c38cdcc752dd84b396290c40e2/sesurojifi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/zelipogobenowerolivoperod.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fa0f4101a---fewux.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/57540f4c4f9d72e693e4f50605d0d2a2/72867089543.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/74859565476.pdfIn PDF document text
    • https://iohrp.org/f_files/files/91009394994.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/4d1afc35c1d45b937f813c47d294cca9/76307665322.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/34437853325.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/zexexu.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/22032692826.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b995e1d53ae---texabajo.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/60c595a02c013583414d17ef62d82a50/baxagenuruzusojivarat.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afe449db257---kemuzumevepo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/33157794390.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/82430871107.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bb96e9ca4---sitopobosidodumujemenipe.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071304532373499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=minhaj+naqabat+book+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_off0000c6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 10652 bytes
SHA-256: 52533fbb24b3a2f567455a2415c37d2538062b769a4d288fc956b96ce40db2eb
font_02_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 17788 bytes
SHA-256: 0718436698c800d93c3409c1f895ddb0011a32a830fbdf149594e1e76457b6c6