Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcf766f9477f767…

MALICIOUS

PDF

88.7 KB Created: 2021-09-23 02:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b726167665652c5b9ab0f740ffe5445e SHA-1: 4fac3816304d1fba129d77d78561576ab38c8863 SHA-256: dfcf766f9477f767f6794e62b207e3ba2bdb8024cc7929da5f7bac2d56eb514a
164 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or SEO poisoning tactic. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading unwanted files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=android+benchmark+list PDF link annotation
    • https://zmiz.hr/userfiles/file/65039707355.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/59620749243.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/xajipoxasukepulo.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/molifogilunukalu.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/judanarat.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/48106763189.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0cb168e2b0ea84d412a80c9d4e3bc912/25965183136.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/muzomogemukag.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/27647949764.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3cd581ddf0e98d6822769b69027633c3/62296579704.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/61451689956.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/vuwepuju.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/bomuzavibafizekidu.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/74970149146.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109140320116342.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/dadaz.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7dc6e693---19328218685.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/83512575815.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6fe65d4fe1d6e20f74463b1bd46773b1/fefobilevijosogo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9cd0e3618---67094086801.pdfIn PDF document text
    • https://samowar.me/upload/file/vasaxav.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/wokivedifakaz.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_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 17948 bytes
SHA-256: e991091aeaefbc978a699dc1ac9cae1c705e853cc840ef97c61c21a32f6d4d84
font_01_sfnt_off00012459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C70 10848 bytes
SHA-256: bff2dde1e49bab99cf7230ff75f3ac6690ef9577e064b4952f1d09592ae543f0

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