Malicious PDF — malware analysis report

Static analysis result for SHA-256 f028fe63b4286a57…

MALICIOUS

PDF

95.1 KB Created: 2021-08-12 20:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa6b7a3aab09cce278d0d6c8e54479bd SHA-1: eed076d85f617c060d04a238e04b6b3b48be6ca0 SHA-256: f028fe63b4286a575f8a575afaddcbe662465f7d9d34b0e01b6f5a551bf74b3f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting the 'formcraft' plugin's file upload functionality. These links likely serve as a distribution point for malicious content, as indicated by the ClamAV detection and ML classifier flagging it as a phishing trojan. The presence of a link farm and the use of compromised CMS uploads suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607633f3264cf---topasuv.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084643a574f7---pigoxigixosekitabunukata.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/dufuwekitoguzetadodov.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf2ad08836d496f30e60b0a481df9bef/60990145114.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1039677748---wikajunitopedipejameluza.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/60c4583d5a1e0d71f1f4730035303464/vizasewusidejizatipi.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/komujifeguwo.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/pqrpcsdvn2s2pp7ur0ikc2pb21/bewivogijetobuvuk.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/73879705433.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/48670348310.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fcf7d68cffa53ac0665746eae6869667/88926460461.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1d8vcsbmfelvkvsgj3740sgkf7/64514928367.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/94445377307.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/66177675531.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8635058668---jikesazimigesujoxepudifak.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/587554eef6f9788973088130268140a8/tosowemituxezo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ac63242a9---87118740891.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c86a7d83635---voruzepelino.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/6913871784.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/zuzonagolo.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/bipegusoso.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0a9fc63063c7dbbdaf2d1409b81f047b/nixato.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5615fed4d2---53592321597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=inquebrantable+tu+libro+hacia+la+libertad+financiera+pdf+gratisPDF 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_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 19236 bytes
SHA-256: a12c8678e25d51603a82933f74e5fd067a97b64f7ea6004c098f93a0c86d1d96
font_01_sfnt_off00013a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15239 11236 bytes
SHA-256: 11c9dedfa3b2e32b634800c80f7ddf2ed7809f7e029702c6e953730bdb77322b

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