Malicious PDF — malware analysis report

Static analysis result for SHA-256 892e6c153938d161…

MALICIOUS

PDF

128.3 KB Created: 2021-08-11 02:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35c10afd0ea5a0507ba519470e612d9e SHA-1: d8ce58abd2c1a4bf9dcb01bc0244df36322bc3b5 SHA-256: 892e6c153938d1614029592828d6dd244eb19875f6c15327f3c88595acbe3043
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c03994028---94519653420.pdf In PDF document text
    • http://tuclubcr.com/campannas/file/79884431554.pdfIn PDF document text
    • http://aqcons.vn/upload/files/31430873650.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/57543637694.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/81707330945.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/wepotugitimaxumupujava.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0611b1862be53dc121e2f2da4d533dd0/16479796528.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/dofozudofojufuvotuwotoj.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a77d2d5d6e---43872624218.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7462b5b196---63939936022.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/48823468090.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/padite.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec4fab700---82098148880.pdfIn PDF document text
    • http://abwva.com/uploads/files/gifulox.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160baa97272f82---89132334729.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/3540951807.pdfIn PDF document text
    • http://kahasat.cz/data/file/xogizuleruji.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/2374093201.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/28489981264.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961b794f079---gipifakek.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/gozetesozutulokova.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2d57564de617bac68b4aac0bef0dc964/wojamomutafifepola.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb3ab0743---dunedug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=que+es+una+programacion+neurolinguisticaPDF 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_off00018d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D7B 10876 bytes
SHA-256: c72bc374faee5d39d3bd8a6d332a8a5e411b8075566a4f32fc0362c3c7030c3a
font_01_sfnt_off0001a6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6B1 19456 bytes
SHA-256: 50adb1f339dcc9c99de20131aa90d8fc4bd40bc70b14a340123cf979f8bfac9b
font_02_sfnt_off0001d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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