Malicious PDF — malware analysis report

Static analysis result for SHA-256 66197e9e66ff5a91…

MALICIOUS

PDF

82.1 KB Created: 2021-08-26 20:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0add740a43f5b0c591fa84777501459 SHA-1: 74bbdcc5faa21f8accdc4c3b9212bf49a37af262 SHA-256: 66197e9e66ff5a915bf5523a764f26ceea8e059addd830006f508aac08bfbb1f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage attack designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://synerhu.ru/uplcv?utm_term=bloodhound+in+a+sentence PDF link annotation
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f22e85f41b---vasabazav.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/35bf147660d1054262ac9b1f2da16a71/dososirevavujikuxemibiji.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/zalajasolojuzenoruro.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/46445572721.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ebac65ef5---35354886589.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbcd343123---fanesanizomajimikog.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/9641912879.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55ad0d67d---buviridirinaporat.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/sorazotos.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/707044f215f45cd05af8a57a28f60f5a/vijizerajob.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/51327539034.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/dutatuxorego.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/2245590558.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/simesawexemunavexafinim.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/midav.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078d52494ffb---nofesikamobope.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/89696885528.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c791755006---17684156010.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2cb7a104ebad2c7c8f05f9d9dc0de5e4/91752547822.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/70152998539.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/92690702600.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/jilelajojomiven.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5F 16892 bytes
SHA-256: a108a6b308172f7a68b48a275edaedaf7f1ff4e8fbc862473021f452a3e58914
font_01_sfnt_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 2020 bytes
SHA-256: e544fd9b603cd298d44115de41899d49921ae4f2020deaf13c24d01c57c55def
font_02_sfnt_off0000dfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB8 10520 bytes
SHA-256: 4049db5ebeb0e11186294a337e416f4f1396424ebe5872362ae6f3136f64edd7
font_03_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 17104 bytes
SHA-256: 2be5ca918dccd0197a726784822775b74b23e68c4527e6ceff6f35c30f77b70b
font_04_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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