Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66977c03e97160b…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 08:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b5a17758eb9110586b3c1aa16246e6f SHA-1: 569928b41d06b7f21d617e955b01d24521c12723 SHA-256: e66977c03e97160bbcd6ac6697368d3f5318e2a71854c78f92961a435eefbc9c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a common attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=best+lens+on+snapchat+for+selfies
    • https://kozhikodedeaf.org/admin/my_files/file/susofuziginilolamedu.pdf
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/dajabupus.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rb1sc9sp7bk64ldeve64g71no4/vavuxorawoxikaliviwe.pdf
    • http://carszana.com/image/upload/File/laduxakoxojal.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/wigudur.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bf74c9570---piret.pdf
    • http://liveranigioielli.it/userfiles/files/xefolulixasivuk.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/42400792702.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/875e73f4478e3f71f2bc966766e40442/87370812907.pdf
    • https://dotcomtravelegypt.com/userfiles/files/tenazumezurapav.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/fdf05552a315b769c2affde7860787dd/fululo.pdf
    • http://evohome.pl/userfiles/file/55223495490.pdf
    • https://stratasphere.online/userfiles/file/28472282189.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/7aa22e515b8fd98233f4b121e6983855/jirifajolilisiba.pdf
    • http://decamiones.com/userfiles/file/kuvesogo.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba75fa38a5a---tidan.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/de4oenabu2kcc9g92k707qnh3l/65672415406.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210620003746.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8f683c3b0---fudiziwasisoli.pdf
    • https://contabil-fiscal.ro/mm/file/3849072882.pdf
    • http://dent-pro.cz/pic/file/4654652419.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/6863454f5c35ed8e66af31062a675cec/30053708393.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160acfedeeeab2---76377956240.pdf
    • http://eksan-ltd.com/userfiles/file/bajesusunuxodatem.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/4hbofbi8a4c1jr0i3jqa75m7ea/xuwulipapawawiwafuverili.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3e.bin
69370f6c74b2d95222cf978830b96b8e7c269e15bd32e9f862034e5ee23a6fd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 10632 bytes
font_01_sfnt_off00010387.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 16792 bytes
font_02_sfnt_off00011b99.bin
9b76e19a92f835bb3a36a875333cb99cc633d67d0f7adf15480447fa603c0f6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 17360 bytes