Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7dfccfeb34fad9…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 05:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce4177f027fb760d15b873d903a172ef SHA-1: ac7c24ad3cbba707e5c3f9bf8b60160411e2ee0c SHA-256: 1c7dfccfeb34fad984d0c2410ab394309d97f9618cb0360571bc80f02734fd7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://darshanam.com/ckfinder/userfiles/files/19550231866.pdf In PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/refovunomuxesi.pdfIn PDF document text
    • https://rajakedua.com/contents/files/kexojoxojetudi.pdfIn PDF document text
    • http://airfa.it/userfiles/file/81990441367.pdfIn PDF document text
    • https://value.ae/userfiles/file/19154500833.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613817d2b0c2b---72989019083.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/89886470281.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/rimodozipafinozuked.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/nuzegipo.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/gaxoposagixomixo.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/sigaxodixe.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613757335ad66---46088355632.pdfIn PDF document text
    • https://dafelia.com/files/rifowunu.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/najomu.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/fitowasewadi.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350ce4b9e37---18383435129.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/99450788176.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/4610086920.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394dbc08a95---vapokekibuzotudamisumase.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130085469eba---begesizevelibabanitob.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/96576292167.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/jifoxam.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/dosugukaburazaponuseju.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/3295863720.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161395d6002158---vipodoguxapi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0da735c2661487c85c49bca9a8389b83/92809224687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=save+an+email+as+a+pdf+outlookPDF 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_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 10892 bytes
SHA-256: 9403872f709a59674f5fc3a0c8938e2ea437954525919dc8630d6fca98e67eb7
font_02_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 17504 bytes
SHA-256: ad26bf077dc396a979352f0e252349ecd74412d8533ce3c6c520898988995ba3

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