Malicious PDF — malware analysis report

Static analysis result for SHA-256 377a0a549a50ccb5…

MALICIOUS

PDF

92.1 KB Created: 2021-06-25 20:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9344cf6e593323f931f7a392a27813d8 SHA-1: 163ad9c793266575c8cb63e4fc8cfa63149fef11 SHA-256: 377a0a549a50ccb50976f8fc2312d7df83ff5eab5e748b25bdb16716e43e42c2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external URIs, many pointing to compromised CMS uploads, suggesting it functions as a downloader or redirects to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=excel+to+pdf+free+converter+download
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0a94e585---fanaral.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/digexiwalemujirikitob.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608455890ce1b---29111648475.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/677ceb9fe587a8887d6e0fc6a4bcf5de/vuzonedubudipifeporarisaf.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9ddeef4060652e11f7a374e99b2da2da/15155854297.pdf
    • http://chroscina.com/userfiles/file/8316581621.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6bdb0f2b8---61334209195.pdf
    • https://abofahed.com/userfiles/file/pumili.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf444a72f2---39529841955.pdf
    • http://watthaistuttgart.de/userfiles/file/37948460125.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097671610ad2---91203895182.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078687899dae---tulukepekovopuvaxafis.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u0jdl2cslsgg3m83i577qnqv74/36158880451.pdf
    • https://drticket.ir/basefile/drtiketcom/files/1835106867.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b29062124---66886782480.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa28fcd07d---wujalixejano.pdf
    • http://metaglas.kr/userData/board/file/dozoje.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac42135df2---gurujulena.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/5626988657.pdf
    • http://docando.es/js/ckfinder/userfiles/files/gunoxabemut.pdf
    • http://thuduchouse.vn/pics/file/xefuzafixetizazevogoro.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/23662198126.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8a1c54f9---74921945449.pdf
    • https://biovuspharma.net/userfiles/files/magenimibitivir.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/afcr0qd3hpnurjeti9bueute10/15158712049.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_off0000f11b.bin
97e295771215332d05007d6b1a727e72f05d465e90ee2b84cd3f4260a64bc7bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 16572 bytes
font_01_sfnt_off00011c3d.bin
331daa99fbff6446964166d7ff6587d4a32ac0de30aa7797a22562961d370c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 10588 bytes
font_02_sfnt_off0001349f.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 16144 bytes
font_03_sfnt_off00014a1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1E 16792 bytes

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