Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbefcb1ff4b697ed…

MALICIOUS

PDF

125.2 KB Created: 2021-07-17 21:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2acf5c376edeb0543c8faf19d51c5347 SHA-1: 520fa9ae7928d2d9e9bb068eef433afac87ef2b3 SHA-256: fbefcb1ff4b697ed02c95dc707678a7f38297a321f2127e85c116582fa58e43f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://maraulsan.com/ckfinder/userfiles/files/76956903046.pdf In PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/48187691652.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea77ee897e---64069734920.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c10a57037---selen.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1223440d923a222fe1d92cae0f78fc8f/wokuporukusuduxozut.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d04ce6b366ecd4f10356197884a8841f/vijoroxuvibidumexemukewud.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/6cdbdbff89782975a9b82455f3803de0/89906840932.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607254152e9dc---geratel.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160742428016d0---petokusapusupotize.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942aca19a36---xegisetokevuwigadelarokar.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/32228146993.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/goporupanogajotupuv.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092b226bdbd1---24564892859.pdfIn PDF document text
    • http://altinay-law.com/images/file/sokewiga.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894293f2f43---xidam.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6af95aa74---loboxarivukep.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aca51c81739---88487167694.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/nenuzerunaxepukanesarasu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bb8f57849---45370796460.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/3470558879.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a5a3324a---wejupub.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/63795400875.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/679cf97cdeff0a24f45d05a2a2f99669/8592298622.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/gefixusixosufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=choose+the+correct+phrases+to+complete+the+description+of+the+picturePDF 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_off00018734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18734 17672 bytes
SHA-256: faab30173a3b9e3dad2af86eb6af64292538c56d64415a88048cc399105344ef
font_01_sfnt_off0001b576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B576 11016 bytes
SHA-256: fb4b8b9033a4f96570b3a969722074c0de9b458525d715df54f839d990914f12
font_02_sfnt_off0001cee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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