Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a966ac4e1094f2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 00:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d1a734d5fa7b7e3f88fa45adfec997ed SHA-1: 43be266f38b56fe1b55bdd1d56fcbed8294a6fc1 SHA-256: 72a966ac4e1094f21ad179be31361f7333cba6773fb6d3d92bd5f8102f471862
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs that point to various websites, many of which appear to be compromised WordPress installations. The primary purpose seems to be directing users to potentially malicious content or phishing sites, indicated by the presence of 'utm_term' parameters in some URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=eleanor+laws+barrister PDF link annotation
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/qc4f03p51pqeb2rk3dofcikou9/dogitojenuwunusesul.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/44201661719.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/qm2ifr0dr0acbpvdt1gjj35th7/lapadaxiji.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/salupoturifabadaxoje.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/82069246960.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/vuvekixuzerokegusivozod.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f3ea4d4f3---85485511027.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/23178744071.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/97heb1c6o0ubf0sn1ret8b2rn7/gagasupowexulega.pdfIn PDF document text
    • http://anupbolivia.com/images/files/fexagapifok.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7836fec7de3e57071b151472dac4240d/dodajeridotibot.pdfIn PDF document text
    • http://caramelitos.sk/files/33820124598.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3ffd78a70af333b27bd8b848b5ee57db/62271274877.pdfIn PDF document text
    • http://flgr.ru/files/files/39233155144.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/omskqd8atctdpp408nisoaq38h/norarokemomavirar.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e0d4fb4a---kijozunivemenojavif.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/dfaum74gfocap0e448gql2um45/24328858182.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/tazowidewuvifodigiko.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab4d1a0c1---87971315131.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/xupopa.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/regewufugelebi.pdfIn PDF document text
    • http://schokozentrale.de/idata/sarul.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/guxubokebulipamaxeba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 18020 bytes
SHA-256: 7b48fdbb4e7253c66e73de968e5664d2dc63d5c7b4eed89bb34b3727fb37a17e
font_01_sfnt_off000112bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 10312 bytes
SHA-256: b8a0bce6146eacd198cc662e43be2bc1d70f840b205b496b637056e3cda60a0d
font_02_sfnt_off00012a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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