Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7afb754cc74df9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 16:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5046f377a453112447e9e4c29e785764 SHA-1: 51a2475f807b5d9cd67dc35fe7c2b88f52e3b9ce SHA-256: bc7afb754cc74df90f1081353087175719004ca0cdcc8947daa60cfffa4fc816
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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 https://oniceh.ru/uplcv?utm_term=android+file+transfer+windows+download PDF link annotation
    • http://kingsauto-bar.com/js/upload/files/vowopexulitug.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/10462892771.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/71203003348.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/lozifopepen.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///91369969205.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/79500536025.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614273c5ce69c---dutivala.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8b70745c8---60051842003.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/jemowapov.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f88ee6b0a9---98574577923.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/17560697426.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/minazubegokemigobixusuti.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/dujulud.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/donubazasupup.pdfIn PDF document text
    • http://vce34.ru/attachments/file/41947793217.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/januxatipazunukatom.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614241b80abe2---52181654657.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/72990993903.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/sufarewifolosubimovi.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/legapezuridegu.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/peraxisomisomomun.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/muleketesabezivavuwaz.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_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 17164 bytes
SHA-256: b54e27fe28460546145fb804b95d7ffef29dabb36ff6a96d939452b32f47f22d
font_01_sfnt_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 10412 bytes
SHA-256: 9d9bc98048c4582a107dd47309b751495bf0023e66ad474846f6f9b26e99c471
font_02_sfnt_off0001248c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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