Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f993b9ee41f97d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 05:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77ecc0e7d26fbbf4e98dd555dda996e0 SHA-1: 9e67d495d9ff5991c1a2e08f9a2ca3671b58f8dc SHA-256: 65f993b9ee41f97d05b0d851384ab07c20f78b321b9b89b78582173de35a9385
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=honor+8+pro+update PDF link annotation
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/5684597550.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/2947779487.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/41175386072.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/80237500039.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/raxobokafofe.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd36d082f---tatuxirekon.pdfIn PDF document text
    • http://cjatkinson.com/userimages/94408129085.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/3767718931.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/38eb5b39ec63a4cc245047d1bdeeb940/45387637399.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/63044520122.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/zevujobufudirozozojogov.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/tufomim.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/16056128251.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/41987424509.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/89055426072.pdfIn PDF document text
    • https://keongracun.org/contents/files/gogiponifutasevututiwa.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2af4d0e9---13946124158.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/37590212894.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/80460847657.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/zavaw.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/xawizanukufokalifu.pdfIn PDF document text
    • http://na3.it/misc/file/goziveminagadedogeb.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/dinek.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/lesigitemiraponevorubuga.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/tumutizafutigafopezekijo.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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 10376 bytes
SHA-256: 354cbb0fb6a3ed7537a9c4c2ffcb00d9397f9e92ef8f277fea3f4c990cae236f
font_01_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 16664 bytes
SHA-256: 73c76e634a521590300602c08207eac867aa18885ccc4f73f505546a7b61c474
font_02_sfnt_off00011ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1