Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bf20754cc4193e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-24 19:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 313ba7c9a458d62143d8872b2dd2c388 SHA-1: f59af5cf48fe281ca38914e14b35bdfa0ac046af SHA-256: 98bf20754cc4193ed5c231b09cc75e2b55cab7612a1ebb8c79c3d289ede921b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://crewmak.ru/uplcv?utm_term=tubemate+2+2+6 PDF link annotation
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161383d8173c01---tiferevipax.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422c8519f90---15763149993.pdfIn PDF document text
    • http://sdds.be/userfiles/file/59127328903.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/18057584648.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/47404222061.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/71492936607.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/78389030116.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/2390538936.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wexipumelaxulajufiwu.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/penezopudojudapanuruti.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/83533769550.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/47414652418.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/47723417923.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/87777728571.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/94866616836.pdfIn PDF document text
    • https://renteci.com/imagens/file/vufemi.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/59066109321.pdfIn PDF document text
    • http://only-svet.ru/upload/files/demizelunamoromopirazok.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/95455467588.pdfIn PDF document text
    • http://bienbao.net/uploads/files/niluwatale.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/gaxilenifusovapupuzof.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210908021335_godrv1.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/33756494515.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ae14837f1---70795768603.pdfIn PDF document text
    • 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_off0000afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDA 10128 bytes
SHA-256: 4fbf8cd79620429114d12858ac03a83cd3e51817b20af2b8fd6aaa2919262869
font_01_sfnt_off0000c693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 15056 bytes
SHA-256: 4c1d07db9798425d01d9ca927b30bd2783ba8e290be0d69724cdeb895b2e8e7b
font_02_sfnt_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 16496 bytes
SHA-256: aa3595da9a77a6640e02ebf276625b418a861bc2731109bea5ef55dc2a169d92

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