Malicious PDF — malware analysis report

Static analysis result for SHA-256 258e4b546ae2ce36…

MALICIOUS

PDF

84.4 KB Created: 2021-09-15 19:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7966dd776b9501cc53aa18a359541bf7 SHA-1: b2fc8d64ada44668f83cbef540b79707169142e2 SHA-256: 258e4b546ae2ce36f866a30212974f0f9868354f58597c7aa34c3467c4375478
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://akonis.ch/userfiles/files/3106772650.pdf In PDF document text
    • https://rajatotogroup3.com/contents/files/jefazafalowigigofara.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/23534095022.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a2ee7f384---laxumemepadodo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9fa9f84d---40521125411.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/17474431802.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/kevowiwaxiforokojofe.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/rigitoki.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/8706048244.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/83947651152.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/sikofupuraxilesipipon.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/97866700001.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/betosapulobok.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/koxid.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/nujovabafefejitagot.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/73596932835.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/77561980357.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/zozilewe.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/77906406544.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/hj3g1ju5jhi814vgv2q4h1m17n/kijunagusirejawiboru.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161414351ca4dd---91067218198.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/fb121ddea0af568f2b71ce6d02048526/vumomaliwufakiwilabos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=shrek+watch+online+123moviesPDF 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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 18076 bytes
SHA-256: 1ad81e4ed3b150717f3ad6cb393864f9872ad54d4cd09b26e25da2e3454e4493
font_01_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 11156 bytes
SHA-256: 4c2ff0b6ed810b4cf3fa05d5a383f0a0d83818e99452784c8fd5378f0458a110
font_02_sfnt_off00012c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1