Malicious PDF — malware analysis report

Static analysis result for SHA-256 90eade6c39330500…

MALICIOUS

PDF

90.1 KB Created: 2021-08-14 11:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f1f53372800d2089e65c80c85a99fd1 SHA-1: 3755b0fb3361670a1d1ecaa7613757c25ec4a2a4 SHA-256: 90eade6c393305001d28d1b37ffdbba9f9e89e645c04b9154c18679dac6f8c6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=is+kardia+mobile+worth+it PDF link annotation
    • http://the-bom.kr/upfile/files/77534818331.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dfc16a913---30308015672.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o14o0p50jpmsn0ng2bto0mv5cc/dopugojozebidenumovase.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/sexumopaje.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/31102456030.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/15010525937.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a987fbbe92796a905da78585264d6c51/tirategefenafopupesuxi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103cb8147ef4---94958012226.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7fe75a9a7---83034195029.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/57181859190.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/58884585988.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/tinuzituzozidazaborupitex.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b342b510376---wumugaz.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210627162482513397.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cb132d34c39---85671975537.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c9759688e8c---lapupanazodimalufi.pdfIn PDF document text
    • https://baptistfriends.org/media/3077692188.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8iukcosaa7hk5u700napg7jlj8/79371204585.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/fenexateja.pdfIn PDF document text
    • http://epmachine.ru/d/files/65110891784.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/xaduzirebemewifo.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160912a062fe25---dexupexaxerafapavebanogik.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/55203859097.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/nerewatozowuzasojufojij.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 17804 bytes
SHA-256: 88080171d24e7a09ce429f56d8baf488a94c9199576536182e3b124c7e893bd6
font_01_sfnt_off00012a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5B 10676 bytes
SHA-256: 0f2d7ea6c5ee5f60eeb24e3fb3b358c2cacd5fc6052bd488fe34e2120f8d8f94
font_02_sfnt_off000142e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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