Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1656e02d0967d0f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 05:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d096c717ce84e32ac6908ef1442c18c SHA-1: 9dc3256dc80ed335f8623822b367d52dcd28bc8c SHA-256: f1656e02d0967d0fda886e05975eaa6b992d4a7f5e701f15190b48631fc9cd36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://oniceh.ru/uplcv?utm_term=physics+formulas+sheet+pdf PDF link annotation
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9jvvuh96bvfoemco0lh8oorboq/xerenefobujimolugavev.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/22659409554.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a050ec0a645---gobugefiduret.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/lafogofavepa.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210730034914.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/8478745414.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/54473483669.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/m1ba3gu4ndvja6ltap19mffooe/dewedafekafebifofalideb.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/29830811272.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/lidutaxenawixoju.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/64275454003.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/10c4b263d870bcc5f3022c19ab32db8a/safuvokuwikeso.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/zedadutelivesenivug.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/36469844436.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/36814074810.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/55937934464.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8b0a9cb7bce54f49e88b1d5d1c6b6a45/kujetotow.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/422beb9316da004cb574aa623c24de01/nogajiwipamudi.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/lezisolupijewuzase.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007982a6dac---dekizowivoko.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/39120024661.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161166a0feaf52---6458069601.pdfIn PDF document text
    • http://ndt-ultratech.com/files/37820539797.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_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 10996 bytes
SHA-256: 4b25259eb5651c695137cda519ff998b13d330fc43911816f6bfc2f219ed6c21
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 17448 bytes
SHA-256: 0f8c51d1adedba4ff2bf7d9e3b08eedd4704206bd94b1f10cc85089e2e9a8d30
font_02_sfnt_off00013277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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