Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc9f6efa729dc0b…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 08:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 857098b3270abed7b513abad05ef3311 SHA-1: 2da37927670633ec287674fd9fc97f39cd567ca1 SHA-256: bdc9f6efa729dc0b213b54f980275d88b1516097379c43a0f49e3094dfe522ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM points to links on compromised WordPress upload storage. These findings suggest the document's primary purpose is to act as a lure, likely for phishing or malware distribution, by directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/tf956f49rdkpt9iukrgu3ftldr/mixoliwanotexurovedivames.pdf In PDF document text
    • http://hujiangsy.com/upload/files/pabiwagovitojavewo.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/61247662804.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/vilometarezijax.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/fudagupupexuvasojogu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba19026f8---74867418102.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/958b85837e7fa59fc9d01f6afd6e6a04/fukelozufugowuxaletoju.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/dajawedizubiz.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/petotopesopeveburixonok.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/78377109122.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/64929629060.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/41fcf95db218334b8b4710490fa5932e/xuzijazuseforejexonopa.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/xovisijowefupatob.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/361690cadb0d910e18a5016870967965/68333183263.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/88621125208.pdfIn PDF document text
    • https://emprenderem.cl/files/nonebutizevopazalafinadib.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/928824725.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/fibidoba.pdfIn PDF document text
    • https://tch.lu/files/files/vedovipupan.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f89589b733a---36685069081.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1625275284175349837.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096018c8597c---1541977013.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/fajugefofu.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/seriwikuwalanikagunubete.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///95384972118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=brain+teaser+picture+puzzles+with+answersPDF 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_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 18056 bytes
SHA-256: 713df9014b11be77edaf9a9a6197b4128dccf59a4528290c4e35b95129a7ba61
font_02_sfnt_off00013a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A16 10648 bytes
SHA-256: 12507fbaed588e8c9e0e8b4b4dd77cbcd97ef70334d8d404abd18daba3fe2e4c

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