Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8ff6679fe03eef…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 21:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d3860f2665bd95196de1a03107d9622 SHA-1: 13c8755257c4e7916cdb905361cd5a34900a1fbe SHA-256: ca8ff6679fe03eeffdad6bbad362107cae15e66f63b1a42ee51c918adee6bc3d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting or compromised CMS upload storage. The presence of a 'download button' heuristic further suggests a lure to download a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=deleted+call+recording+recovery+app PDF link annotation
    • http://isspskola.lv/userfiles/files/zugawipuputebiruda.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc98535f13---8630485271.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/kerixa.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/48872773191.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161376b421a53c---vuzabijojebugajanomene.pdfIn PDF document text
    • https://12shio4.com/contents/files/49536428422.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/13202628785.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/bibataxapevatazil.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12d5c6bcb---10825169385.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/31852956813.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b38dd5897---zezatogozoxuxab.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/tuwituvizikejovawem.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16140ada4d9400---12929361627.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/76000227266.pdfIn PDF document text
    • http://ternovykh.ru/content/file/lalozabiko.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/24503961672.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/gojarajibixovamu.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/fa4e33c34420472751f14a8631ec3b44/10608494096.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/bosapubipirepaki.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/19530391130.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b90cd02c9f9aa7125b227f9ee97e3b03/55274286872.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/ziwava.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/kuvafenagutokok.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/88549942921.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/82628680748.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/99233121728.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 10700 bytes
SHA-256: ff0014a0b48cbf7d4eae23a213fc2de1ae8c65102d58861d31b1cd6bd6d3b291
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 18252 bytes
SHA-256: 6d8eb3353d050f6291dfa7cf4f2e61da06a357787f7305adff20b8790435e56e
font_02_sfnt_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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