Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf0c88b23fbfa03…

MALICIOUS

PDF

90.0 KB Created: 2021-09-05 05:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f689db7109894db49e3fe985a1be1cfb SHA-1: 3eb16a5eb04b496c447cceb94e041cde920ab37d SHA-256: edf0c88b23fbfa0361b592d884c0a30a978cbb8950f15db085752a150a9c17a2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting it is designed to redirect users to phishing or malware download sites. The presence of multiple PDF-specific heuristics related to URI links and compromised uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=ecosystem+structure+and+dynamics+pdf PDF link annotation
    • http://sunnysolutions.it/uploads/assets/file/26057264346.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/goxoxosidetufanofesujetab.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d3c864156a2d8038ec653917ebc78020/kijanugawarumixuwibe.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/dd7ebe5a5e03a22d3193b9b661ea3ddd/90124935739.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/vemuzifepixofi.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/telozowigobijexotab.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae4922555---xakezubawinajumabinak.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/81377832005.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3aae4731e---jowen.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/015v246at690e6oopb8e2vk31m/vorabakenepojageviguzevim.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0685016726d1b6bdec9a362cdc32a9ea/maxuta.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/15214418619.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/72e5b28f6e82148444bf4aadbabdcc89/palupijubirisukima.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/65839220238.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/72167848977.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/3i6ribf7bvhmib4unfijj85ip6/97854478953.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/sobukunituxofimogarexewa.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/nosanudagoruwelos.pdfIn PDF document text
    • http://effekt-film.de/files/file/vitomuxor.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/59626321633.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be876d75a68---72573251305.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/noremuzeluwifimilak.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_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 10932 bytes
SHA-256: 060013572ce008bfc3ea75aeaeaf43ba2f76531b56443e54a48fbc6a5520eec0
font_01_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D65 17456 bytes
SHA-256: 00c7cf9fcbb42ba7568f6ab935df81eef7e44c8bc3f681202acdeb1f6670dc9a

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