Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4c332d8e5f7d56…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 05:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 58411c938225762604cdee069807e0fe SHA-1: ab14ffd577875e5f9e2b44a77380ff1a59fb66d4 SHA-256: 2b4c332d8e5f7d562fe1c44dee8d131c643a563ea055d9a34f7c2029838f1f29
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348b0a7a229---16367809523.pdf In PDF document text
    • https://graveyards-fuj.ae/userfiles/files/zasorizoponetunifugupa.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/90836742736.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4ad882886---2633747176.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/kamodavonijide.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/39a0ebfcb49e31d4084681ddaf0e2d07/14873952790.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/jabilagegamupabuvoxewaji.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/tinakobuzesuxelaramib.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/gerikilibeximani.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/72389747056.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/lomorelavujadoruduj.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/musexi.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/pijoruvaxowarire.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/mubetagoxo.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/mekoburibemubojixanixexiz.pdfIn PDF document text
    • http://52963566.com/upload/file/202109091936006314.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/9425011102.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/35941690734.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161367013329d6---87497104982.pdfIn PDF document text
    • https://retta-bg.com/userfiles/2659299936.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/ruliduvutubivon.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7b557183e88e51b006eb7973aafcad9d/kalogekodedopotezujenig.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/fubegavituvatilo.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/fizisofavemugojipes.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/jinonob.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/bunuwedivigekifofapoxupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hill+climb+racing+mod+apk+unlimited+coinsPDF link annotation
    • 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_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 11180 bytes
SHA-256: 661b246c7a805da96759c6978d3c44b110f5569d56068782bd2eff86332a278a
font_01_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 18236 bytes
SHA-256: 5d624b80c85471686a28a603e31abc962ffaf7c2e090dda666483f0fcc76045b