Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5370a2f007b7f3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 05:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 46017fe852fe654d6e95106a4c6d37bd SHA-1: 36d6b9bff4249ba669892905053ab017da2c0a89 SHA-256: 4a5370a2f007b7f3dc82663c171be4138478e79b7d7087882d8e6624bba3728d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://watthaistuttgart.de/userfiles/file/85130537153.pdf In PDF document text
    • http://jamalcar.com/userfiles/file/tefalenepuvuw.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3f8eb0b63---5531621040.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/15437901014.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/uo715mcsfm6ktmj8os0gens5ir/vagowipabalisesivowa.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/jevipulumozitakuxijeguweb.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/zejoxifer.pdfIn PDF document text
    • https://ahha.az/userfiles/file/xuvipetozeni.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/kiwovilejazujazimonuweji.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/kenujanuzekozilerofenug.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/simajajazagiraxumu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e5d33a48f---wutowijabavevozedepuxika.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/13652791253.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/batigariwavokuwufakijik.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/lekasizeviw.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/bikagijonawuliwibi.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/84938796256.pdfIn PDF document text
    • http://shopabrang.com/images/files/68606301888.pdfIn PDF document text
    • http://hkwwta.org/userfiles/boburozegugabil.pdfIn PDF document text
    • http://markone-tools.com/upload/files/benizesolupuwadituwarotip.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/33554430694.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/gadalof.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/17777822147.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/gapufawuxomavub.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/12490547154.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/948221949613d1b1a152a1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dark+web+links+download+androidPDF 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_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 10460 bytes
SHA-256: 08993a5e8f3504ca2d7cb384d6d74db9ec3fd9cf4b4c35e8799e25d643e8af57
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 17368 bytes
SHA-256: 7bc8f05e63d7a88dc48b76f321ec8ce580b09602a210670509eecb036ea321a8
font_02_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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