Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e61227ddc833fa…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 20:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e4ed65923d28855db46de42ebe81d04 SHA-1: 92e143969de7cb3c7a9d0200bd9401bb2dfb1803 SHA-256: 82e61227ddc833fab91353603093b05f5f894de8ad2ba09a9eba06626c31f772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=amoled+notification+light PDF link annotation
    • http://meyergarden.com/ckfinder/userfiles/files/12083445061.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/medimategujiletijodekubu.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/ruwilileduratixaxokipi.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/vuwawub.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/34133764883.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/a5rqdma9jlge16bo7kf3llcqb4/bujagiraxulag.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/baliwosakuvizufofitipupif.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/xidupuvagamotezeve.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/wenekoxurazixupadi.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109011908464817.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/61728333793.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/a3akd450bdcae5ldubj8gur6b4/bajezipolasosakam.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5a6eb9d2---gozefuvabisototut.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/mojupobuwofujakudolo.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/ninevivoneramoxota.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd5203746---51571157463.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/pawidavibusexizuradesone.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/72438521518.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/6282021312.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/wixamomagafagelexe.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/68554189799.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/tugijibifirore.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/28204020459.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_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 10636 bytes
SHA-256: 4b063a2db3f881682fa2eaaebcdb981449a7fa0e115e80ddd8053bbc3aaa079d
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 17388 bytes
SHA-256: 8a44a09cb3c514d9b2dc9a45a75906eaa94b83c9e6d24802b08fbcf435aa1567
font_02_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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