Malicious PDF — malware analysis report

Static analysis result for SHA-256 51013305523de300…

MALICIOUS

PDF

102.7 KB Created: 2021-07-02 05:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 220daa227465fbfd11d40617e307df0f SHA-1: c45dd11b15bb0da890a2abe258f0884b2982673b SHA-256: 51013305523de3004fe883a2e0f2740dc63dd849f9d6c039122a3f2f425fe6f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress uploads, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the detection signatures indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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=strong%27s+concordance+1212
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085527b15105---xunado.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608030399ed23---xijoxoloj.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce55c176de---ribepoji.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ad505a442---rexozakegadikukumibedif.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/b04ad1157df221adfb34a10358d186d7/67527870694.pdf
    • https://dietacud.eu/upload/file/3204978296.pdf
    • http://botosani.ro/img/uploads/file/sazebis.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d057b990e38---vetavoginovubopu.pdf
    • http://reitinguok.lt/userfiles/file/93507861791.pdf
    • http://yule-sign.com/upload/editor/file/20210606074703.pdf
    • http://trustarshida.co/cache/fck_files/file/57118937413.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16089d835a253c---70185282705.pdf
    • http://udmvdpo.ru/images/files/16735835620.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b57b03705f---89690436120.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160756cd5e8fba---vizowu.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3516c6d535---60346918756.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/bc263f901df6b2a79945cbf60f991e46/67830604262.pdf
    • https://infiniteprospects.com/FCKeditor/file/61173964788.pdf
    • http://fzcce.com/aimgs/uload/files/xekusowodol.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffed5dfa21---tedek.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160be2db934fb8---57673333092.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/t6glaqo4msptbv72n0np07guq5/55407094088.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/m6vmcoprr31lh32kls9cvoqap5/30166648778.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7dceda484a---9035006054.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb72336219f---mogututanaduvozogixu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010961.bin
4b4e306300be784386922698483e7ca0966d8f41408dcf010906e869e7e2522e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 21040 bytes
font_01_sfnt_off00013ff9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF9 16792 bytes
font_02_sfnt_off00015810.bin
f1c932c3d249279f701f01a22c30b87130f092d071d880a000fe971f8d7ffe3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15810 10688 bytes
font_03_sfnt_off000170a0.bin
69a93a4441d44d3d024cd58ab6708a1c9b217cf7a1c515453acd84b418a00463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170A0 17544 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.