Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a43278b00a9a11c…

MALICIOUS

PDF

93.1 KB Created: 2021-07-23 12:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd52697deb11e2ac27d84b212a51bd5b SHA-1: 0943a4cddad2cb22e417be0f35290542f2fac436 SHA-256: 5a43278b00a9a11c70b46ccd8c073351723e0e341a126a6c6bb6082015604fbf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wegofa.com/userfiles/file/sidog.pdf In PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd19e11d544---41668821825.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a5e30925a032475a9ac3236bfb5ac75a/85266076906.pdfIn PDF document text
    • http://lawngo.net/fckfiles/rofinekilu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/df31788410894bf4da77ef392c16f47b/pesojobepo.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/33136417845.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/bekumupejexon.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/612b3034c91363af1271435b4806feae/95495626918.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/wolujonosijejodelefoxolu.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/68058767121.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/46096405450.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/697f1da0874cac2218750289cb076f74/2859812323.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/57992863753.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/252036155893.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ba7ff01000a38de37eadc345d6231099/89658427377.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/66601141852.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d1826d440b7---14565211217.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/09e3ae43db7d636ac2aa8720fe86ef7a/81085159733.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/figuruxesanar.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/miburomu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/adf27ac70cc5001f09e12dbff0b1966e/29802867729.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210716_01E19944E8ABA129.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3788f9aea7b288d9a58aafefdae2ee83/xagasulajulatebunatoz.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021060216071794.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/tifetirulet.pdfIn PDF document text
    • http://drisraadentalcenter.com/userfiles/file/fatumepubevek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=spider+with+orange+legs+and+brown+bodyPDF 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_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 16696 bytes
SHA-256: 63efa5aa06ba2f8e3ef336b425a73ce6df86bc6f835787a2895b9d36ebfab4d3
font_01_sfnt_off000134be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 11084 bytes
SHA-256: 9f46b15894715caf05b737c1b437dd59117e978874ddad5ef8ce5d0f456ba270
font_02_sfnt_off00014e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1