Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a33fcc573be97b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-18 11:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 628d6cc688cae392bd1904018dfef1f2 SHA-1: 9b844b6d5197cea646283350b4de4a144eed57a7 SHA-256: d8a33fcc573be97bef8b43398d151a563d0b3a605dafd4eb397ae092bef82b8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The heuristic firings indicate this is a link farm designed to redirect users, likely to download malicious software or engage in phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=ms+office+download+for+android PDF link annotation
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132798b9bc2b---40933343143.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/tamopirozela.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cd25e26204470faa180647b8e39920d9/basotoximawafemosoni.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/75128434002.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/tikadebedirawa.pdfIn PDF document text
    • http://lovesenergy.com/file/botamem.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/rupisebeperilitipulamon.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421dd78b6c5---51790037308.pdfIn PDF document text
    • https://mollis.rs/files/vareropigasazazemobi.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/56414292033.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/34755498215.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/69655205943.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/bukatujusubofu.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/giviposamavamiv.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/74306097601.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de0e9a9379---finulolafavu.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81512588638.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/rivedutobebojele.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/68885574914.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613251eeca144---dozadoturisomigam.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/30751026408.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/34782304072.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210916071528_l9xoic.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210904_2CAA9E28DEF9B18C.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_off0000b245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB245 14724 bytes
SHA-256: 15a9f3003788bef0b533a3001364666af7cc7e27d23d3a13c5e3e400a5d879a0
font_01_sfnt_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 10448 bytes
SHA-256: f02e3bf3933db008add680d2cbf3bdf420b60335fab6159e112b63997c4b8aed
font_02_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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