Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c7b56130f82c4e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 07:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e4e0da8416fdfbca9d7c9064ccab689 SHA-1: 78eb610623ad32fdc90bfb17dd77a0871a0f21ef SHA-256: f6c7b56130f82c4e74b96f7a93e14b4b8748160a4c0af65974ccdea71b8f9adc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://silver1979.com/upload/file/daxapeludakifezimuf.pdf In PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/58154722189.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/kapiduwon.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/posufonesusepiv.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/lowisupisejara.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468521ecc2b---62134844034.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/nahdi6a63u37p226lq0ugrnpfn/67738234532.pdfIn PDF document text
    • https://signika.pl/Upload/file/80420691024.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/bubinepudaxarogexoji.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/wudakesajizowalebinetuj.pdfIn PDF document text
    • http://mobil-tech.com/files/wojovusetolowodigid.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/16536528517.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gibogaregif.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/87039663252.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/65790751681.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/wamaziv.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/wonagapejememojamagus.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/82233991654.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/75779060727.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1bce636915a7842ffa7110496927c0f7/tijeg.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147bebc18349---78865651151.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45474617a---54489125859.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/62321135601.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/95770574850.pdfIn PDF document text
    • https://costarica4d.com/contents/files/79728882748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hello+kitty+jewel+town+mod+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 20996 bytes
SHA-256: 3182128ab80920c7360ae4b0912858a7dbc2a38bb2cc4a6b293cf4c338f4d4d0
font_01_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 10696 bytes
SHA-256: 9e993c11e7e01aec43dcf73164e6f7cfbc285cb15a754b7105de9f1f220ec1b1
font_02_sfnt_off000122be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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