Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d886ec84224537b…

MALICIOUS

PDF

90.7 KB Created: 2021-08-03 23:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 8e51de8888fc9177d89826041b09992d SHA-1: f8e7c924ea187dd482fd3fcb4e9793ef8aa90642 SHA-256: 4d886ec84224537b33fb776ee4ec90aac76ff4578c6ff29b1b0637bc3f107286
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these URLs suggests an attempt to lure victims to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=simplifying+algebraic+fractions+questions+and+answers PDF link annotation
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/88631638607.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/45123899390.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cc53bb16b---nogabebexirepolepego.pdfIn PDF document text
    • http://fittbike.hu/files/file/16289284333.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b5089db1a9c---winazowisideke.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/60632gj1v61k1grpu2qvh0cv8l/82523698670.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/tusuwozevirujo.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/meferar.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/wazevizanibapesetujesif.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/sagawedim.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1484944e3---25423532364.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/92ff21e550f0e9f7d317083339030e66/xifenimibiziloman.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/tinevebosudivubezupe.pdfIn PDF document text
    • http://onboardviaggi.it/themes/userfiles//files/tufanofikisekik.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/51298183604.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1ca5f0127---betaresejajurajakasijuku.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/997bb5129c365622a5a883a6036fa182/wugebibevewufafekosumek.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4023908cf---polakegogi.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/5a9bd96bf306bf86a6b05389615fb853/29082340028.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/sagavetoxefujaxi.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/23425371292.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_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 11624 bytes
SHA-256: 66ceb75e0a8f2319e3f83190fbd9369518e83cca7979fb4a0e25b23193ccdf60
font_01_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2A 17652 bytes
SHA-256: 22d5baa8d029cceb8aae76472e08b108f61f14c757da25476451cbfd1d5c94cc

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