Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4e360cac551bdb…

MALICIOUS

PDF

82.9 KB Created: 2021-07-16 15:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4331a857a56a155504e592b901b40bdf SHA-1: 4c29dae35869ad81b78d4097d8c963ef3c520056 SHA-256: 9f4e360cac551bdbddabbec0bfee2011d3c0334c5d2964e22ff229dfe2aae44c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to execute malicious actions. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcph9aofniq9nmlv8ut2qu4me7/vafanijejewumixatamaxudab.pdf In PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/55d2bd7c3dd881eaa168eedecc3c63d5/zetani.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a06b4e21---sotiwipituxise.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210714002004.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb77c4947---3813684784.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/57210328001.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/db42057e087050de372301e54e896692/19813834440.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/45715935981.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/c3v7or4cdauc1kcji4k0op8ts2/7500411503.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/lipuziselus.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/83981192889.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/65186970617.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/12551761822.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/sjru5e66f2aihfri5gsi0rjnmt/xitubotolor.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210707_AE7534A98CFAA662.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b665d78f3a---dizutofubu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/13a37df3232a27448eead8612e70f348/pawedixozadomewanuririd.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/kokopaz.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b45c5ff5c---22197921673.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ddaace4fc58---28292268627.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/83441270780.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/37cs1o9d166po59sempt7hv3td/23002424998.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/tujuji.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071305a973b6---desovegukagepi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe79c98fc---bajori.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc494527654---60394463999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gate+cse+2020+question+paper+with+solutionPDF 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_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 16976 bytes
SHA-256: 07ac681b3ce4e8602565fbb531f9e69ae7bc24f349398774db84a314330dbf30
font_01_sfnt_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 11084 bytes
SHA-256: 538179cea77d3658f662522bffda69530917ec4d1e0755921d308e236b38d049
font_02_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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