Malicious PDF — malware analysis report

Static analysis result for SHA-256 69784fd71f20fcb0…

MALICIOUS

PDF

96.8 KB Created: 2021-07-13 16:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 257977deace9662511053b5ce8a2f7de SHA-1: 9270628bc0dbc5fa5244e10b1c5bc7adb10dbeaf SHA-256: 69784fd71f20fcb0afea4294fce8e9f62a10865017c4aa1056e9e65101511ce3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest an intent to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/87budvth879maddi7i1fi0o8m1/wezanawuseka.pdf In PDF document text
    • http://healthywithhart.com/res/file/xujokixomezus.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/zufiratinu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/148f452685aa744cb89f37d515804612/60032028073.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/35797601362.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/40399998269.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/jumimeramuzifamomitof.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/pujupepub.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca9a3fd34---wesuzonajakajupetanika.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/85985370972.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608080461be4d---gerevev.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b09c62486---11289151588.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/fuwagilitotibegepifufe.pdfIn PDF document text
    • https://soechi.id/userfiles/file/kegadevixupebe.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e5e239b14---retapijitalozof.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/358fa19f1b9b65e580054ab2f3aaae31/tirukev.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e24ee41cf---lugenawowij.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c65feff070e---fevebafos.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d75903cbcde---vuzilosofi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090dfbb819df---3960480391.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3u31p6onrgelqlsipsk28gfs22/81678101118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+boulders+ohvPDF 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_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 17660 bytes
SHA-256: 98d9a1e450a86fecdbbf582e984480265c964b7851f31b01fdce15ebac068b95
font_01_sfnt_off00014793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAA 10156 bytes
SHA-256: 3560d80a689fdadaef19e7371ba685b874cc7805a1e14dea9dc7a6c5ec74c2c2

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