Malicious PDF — malware analysis report

Static analysis result for SHA-256 929395096bc38a55…

MALICIOUS

PDF

73.6 KB Created: 2021-10-03 19:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 65a76f3e3faa9b364f01681c0b451816 SHA-1: baf250930d220d3b9c3be401720742071bfce8eb SHA-256: 929395096bc38a55b8cce317556b1bd6cd4ce487911b6ce1a689545898f53758
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the non-clustered nature and use of disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 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://ketchas.ru/uplcv?utm_term=meal+ideas+template PDF link annotation
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/bizebunesovesu.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/pagemato.pdfIn PDF document text
    • https://isgz.me/userfiles/file/69538080418.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/nekamotemizujuguku.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/fisagakagilakujusan.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/8430006274.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/94606919489.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b0277380---21942115828.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/xagijavexiwomiwoxu.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/dotatosebese.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/juvowizojozaz.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/58359625447.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/82362063093.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/34795241017.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/38cf1e067b26d7de07ddd8c31f3ac1a1/31222557529.pdfIn PDF document text
    • http://hotechike.com/files/files/sofifovelinej.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210915174605.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109090142298261.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/radoxiguwujijewizexobati.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/3dc2bd21e8bdfb1ee5af828fb3a39077/1330254875.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/8204000488.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/23038472610.pdfIn PDF document text
    • https://kimcert.net/E/file/belotuxoxobo.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_off0000b9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EE 10224 bytes
SHA-256: 2710bdebb1490dd0d91adc18c54a72ee197fdfd50d359c0f7a5d71a901fdc0c2
font_01_sfnt_off0000d0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 18460 bytes
SHA-256: 5e3b20f521f4cc329002c2986879b902a1a90fb98d63acabffcbad511f4667da