Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d0c21e449ed5f55…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 14:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c97619b372cc4ed795ac47e6fdf866a SHA-1: f94b6d51615b84d029f3b41a72695bbdc8e5edf7 SHA-256: 3d0c21e449ed5f55772b8de1dc9062f26bc472910220ee97ea0af3a359456a11
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure using a screenshot. It presents a link farm pointing to various compromised or disposable hosting sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://studiophotosfashion.it/userfiles/files/35748827589.pdf In PDF document text
    • http://group-anons.ru/userfiles/files/77015947659.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/bameputok.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e470acfa33---22686996127.pdfIn PDF document text
    • https://bunianco.com/other_files/File/58471259289.pdfIn PDF document text
    • https://resepangka.org/contents/files/jezemewikejixiw.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/20657187636.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/zetazabuzodexosoje.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7e0daa18dfe67881727d624a7f173ab2/lobexazasusazo.pdfIn PDF document text
    • https://durimawar.com/contents/files/33436475956.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/97921948212.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/jatawa.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/7242784160.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/3839048974.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/filinosugotiwegutupaf.pdfIn PDF document text
    • https://senegal4d.com/contents/files/92525929671.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/77671863950.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/868c88613084d1cfd7bf8fb129952cc1/dubuxomirejofa.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/97775937474.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/82542677160.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/31541252936.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/445d77304a28e1abbb8048ab33ea630c/72541261737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=real+steel+full+moviePDF 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_off0000b08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08E 14064 bytes
SHA-256: 0b3c97ed52b46b23d22597a76ea91664db8307505e152f61a177e72cf9f32284
font_01_sfnt_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 10384 bytes
SHA-256: 652cc1c8d4638fb8475c834f6c92084dd3d2030d7b42c4a05409b85b88c33318
font_02_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1