Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c93b3a0df2541d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-20 22:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8303bcbb50a078d3e8d3c6572a678797 SHA-1: 088cccfa0dbf396d0b2d335413694b6bc405fe6d SHA-256: 04c93b3a0df2541dedacea3fbcad16516efa3498df2639084b424f2b48eb0950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=best+android+game+booster+app PDF link annotation
    • https://ahreco.com/uploads/news_file/87163081101.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16147c02b8625d---nubimipuzazudo.pdfIn PDF document text
    • http://wjcopy.com/upload/files/72796944097.pdfIn PDF document text
    • http://www.grifin.sk/files/87715586599.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/52330649554.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16138dfc705608---87789146858.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/88468538962.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/86803311156.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/limoravewudarovute.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/jowudikofojixi.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/padugujavigagesesuzo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c15ba4249---nidadalavix.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/tuwejesefapenilimedotonor.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/59353288575.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jobox.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/f4582c07016c1426cc560be6adf130fb/dukudizukulubopafiviluxu.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/rodirofusubokurukejamupix.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/bebukugi.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/defegebitubi.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/pasajamedasoliruzebuxose.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/gufaduzagewawip.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109010805332558.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/bejatiritowesadiw.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tefasivafob.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_off0000b7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A7 10884 bytes
SHA-256: ec554f263f30576a4169e1cefd83a8e9c2375101693f52b770f7e5345e650825
font_01_sfnt_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 16280 bytes
SHA-256: eb6c804e5fa876227e64d50df396e6b8c7eec6a560dd4a91f560a69e66d951eb