Malicious PDF — malware analysis report

Static analysis result for SHA-256 525fdd4b3c14a322…

MALICIOUS

PDF

70.9 KB Created: 2021-08-30 19:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64bfe9f30a702174b31cf0b35cb5c028 SHA-1: 90493efa6693ddab53f10ec01d1639e3502f32a5 SHA-256: 525fdd4b3c14a3227c4bdabbe55b67416274332dd748a9b4a92b85332b2f1fb1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads and disposable hosting. Heuristics indicate it's an image-based lure designed to trick users into clicking, with ClamAV identifying it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 70 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://aarogyamedico.com/userfiles/file/zinizaputewumusebudoji.pdf In PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/woxoluwigurowevawu.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/70274915236.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a79adff2---lomabila.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/99431559875.pdfIn PDF document text
    • http://jarosi.hu/files/file/julotagiwizozedez.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/gomutesowosomava.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/49693297857.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/1343807660.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/28b693b9993b666be54b4b1700ec9fe5/xibedetag.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/26445352871.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/402a377d4a4568b6bd3c52481df3ee64/kowotiveragoxeso.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/ziwamapewebarogidawagebo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6bca03cf8---51813493391.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/77451393252.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/10516162473.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f8519cc461c21731708fa89847a603b9/gifoxopijugipemati.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/semamusulazaxuzimafejepo.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/281456374096.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cdfd4439f---2038323106.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/regunekasike.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/zumixebupifujob.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/mebewovosudojofolabonuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=propagating+daylilies+from+seedPDF 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_off0000b737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 10956 bytes
SHA-256: a3aeba346bd10d33369c80fe835b684f9056072dfe8822770cfd14a8ab688f06
font_02_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 14616 bytes
SHA-256: aec59299f659479d8acd4d9155eed8099b963127eacef4572a16cf1d8b570fc2

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