Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7df1bdc0dcc6a83…

MALICIOUS

PDF

85.6 KB Created: 2021-07-21 13:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a652a855bcd34e272ea928ea6ffe0045 SHA-1: 1526d565b0a642f06f79eb9a01b6353abdff5a8e SHA-256: c7df1bdc0dcc6a836619f690db7d5548ff9f5ecab5279ded93113762ad60e2b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting sites. These links likely serve as a distribution mechanism for phishing or further malware, leveraging the PDF as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://birzebbugastpetersfc.com/files/file/12970522782.pdf In PDF document text
    • http://meble-tk.pl/userfiles/file/777455179.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073b71fe05c0---bereva.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608312ebe4209---puluworubawagaseje.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/nupekirusiv.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6f06b5d3---73002898392.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/65450089015.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/nozagavafozav.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/48699937479.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9acb76eec---37472794302.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550b8e48cf---keruvigasiteninopafini.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e700f0b3fe8---38052140165.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5ad26329e30788ab0e8b7e2696431740/vakuzejojorobiralekugiwow.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/zekesibojero.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/84c1026daaf42fa2ef6b8c4bdf078187/47302151810.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/83153900961.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/jologatenipafukanatux.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a34e73f1156---navokuzatowut.pdfIn PDF document text
    • https://ms02bet.net/contents//files/neximu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/galonozerakirimunun.pdfIn PDF document text
    • https://filetorme.com/upload/files/17591401772.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094487433a51---20778689633.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f58046fa2---87139930162.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/62352396031.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607589c4349f9---4543422918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=schedule+1+income+tax+formPDF 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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 16928 bytes
SHA-256: 029b767bd1ba142748e3ac84ac4f3f25309160217c386be9cfc23343eff6e1e3
font_01_sfnt_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 10900 bytes
SHA-256: 433f97a611f9944fb9a09af2bc798216f92cd66de5e9883c025a0d25226ba11c
font_02_sfnt_off00013125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.