Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b529cd3f7d9c93…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 03:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e3c900a4b1be0d2e5dabf1f1c65edab SHA-1: 3f99ae52cc9bbdac1723f6a03000abbf29ae40ea SHA-256: b5b529cd3f7d9c935275bdede99f2df01f82c14b0e8f5696de73f8894b2757a8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, likely to a compromised WordPress upload or other disposable hosting sites. No scripts were extracted, but the presence of numerous embedded URLs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=lyrics+file+format+for+android PDF link annotation
    • https://thaiahpa.com/flash/files/fetakanewuginetugajev.pdfIn PDF document text
    • http://meskerjager.nl/media/files/10259344958.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/27487107358.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6b6bead5---rekapuxurajajadarepaledu.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/17890234849.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f53bbcd8d3---megewobapexufibem.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407e621a33a---58440143223.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/siwomenofi.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/zedezixanewe.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bunelevoronaxe.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/68318985458.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/39676671247.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210919_1AAD19EB0A6284DE.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/85409291419.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/wavasokijeru.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/fijufatiralarenutel.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/41856522035.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/47802319095.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/kenaxurop.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/18713697709.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/34f4fe68e145e1d6f1fdc3727ecc3dd1/nobowegifuna.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/timopudesezir.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/19343497077.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3gh1d0tqo463q6jbgedc2t0dpk/89967025824.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/gidasarebifezag.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_off0000af3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3D 13828 bytes
SHA-256: f60d81e7c6c75f7b6e3ec818b13e099664f733c2caace16ab353d8bf8d836712
font_01_sfnt_off0000d173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 10708 bytes
SHA-256: 614cade5d1c571706b69cad27e346330cbe794f2f20c188cfde21e9bd90bb400

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