Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1c7430d2e2fe0e…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 16:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c0387941e0254e14a0280a8249d8ad68 SHA-1: 716012a523927d6f8b6788d77ee7aa04b591c895 SHA-256: bb1c7430d2e2fe0ecbcf8950aa4ce826156dd652ec06de09b074b700f8083085
156 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 phishing or trojan threat. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5076

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.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83d231399---7289852369.pdf In PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210914_A2A7295DCA3629FD.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6f91235a1b826d0f5bb5b57baa095d93/63820222683.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614a288215fda---50581598667.pdfIn PDF document text
    • http://speckrepej.com/upload/file/52770353598.pdfIn PDF document text
    • http://metallpress.ru/files/ripujarafiw.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/gapajotodofiv.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vefujebebaxibu.pdfIn PDF document text
    • https://invest.pl/userfiles/file/47160334113.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/pozogikezul.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/32462527470.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ef70cc1b8---65739721626.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/64926519115.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/judidizebuxirewovutimi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e0edd6d8ccf71efcd61c7f175fd77357/50878216024.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/93139174419.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/9223465919.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/pelatud.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/mimazobatazijolusodid.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/xejed.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/67725206829.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/5792010030.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/34578348928.pdfIn PDF document text
    • https://allianztc.ro/files/file/kelinasuzimibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=autocad+civil+3d+2015+crack+free+downloadPDF link annotation
    • 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_off0000b232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA44 17132 bytes
SHA-256: 2665dbfacbed06c08d24469575fe9019a63a1081f7b06f952c20eee5aaa1df6c
font_02_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 11224 bytes
SHA-256: 185e8097635127a60baabc4b38a3d8873beb548e3b6032ac24456b82f4feec8e