Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc95c6071d5c1d0…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 09:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3145fce4d2078dfa7d3490ad2076d3e SHA-1: f818b168f96b8b11c8965df8847cb46a4a9ed795 SHA-256: bbc95c6071d5c1d0817119a51032aa2b65a92c764e4cf9d5adbf0b065c9f140c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using such PDFs for SEO manipulation and potentially distributing malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2gk9epfpo1a9hr52athufsm4t4/vekizumasa.pdf In PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/16371883786.pdfIn PDF document text
    • http://dytac.hk/userfiles/82917164903.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/34916949030.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/tofexow.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/62796171963.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/dizixonatewokular.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/jokuzinimokubokijilazobon.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/84373911041.pdfIn PDF document text
    • http://hoachattn.com/image/files/8816205472.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/53199426816.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e2bcf22e0---70659146927.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c0f7682cd3fcd0b1780136cfb3a93bb9/kubodubirusifagowujenifi.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/zebenidagijewaravuto.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/86321073753.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/76808915038.pdfIn PDF document text
    • http://jsdarvin.com/files/xupaguzaduze.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/99139213847.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/sivewivinam.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131059c2b4d8---53002399856.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/58489472774.pdfIn PDF document text
    • http://willbramephotography.com/lavavodimewonekabaruw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=spider+man+java+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 19716 bytes
SHA-256: cdff2970f338e706958b1a4cbb829b2f3478284555489b9d8c9844b7108388f8
font_02_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 10484 bytes
SHA-256: ad4fe58fdf46067be833c16890ba5501c794ab4e61a529e1009686d921b37ea1
font_03_sfnt_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 2152 bytes
SHA-256: a3b3d76cd2b158a76ed728b4cb9aad6ca43a4cf53613a0ec9a4bd90369cc8d99

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