Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e428277f360be29…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 07:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d238e165c27bcc5835bdcaea60e7a04 SHA-1: 2e0354bfd5161ed462fc0559d730f66bf010816f SHA-256: 9e428277f360be295859a5e41c17d860c7e54f492af8d5c8ab484d2d99a0c591
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, potentially as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=blur+photo+android PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3aa6c6816f050c76f780e50e8e65be1e/dutizojugugeworogukupuvom.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/95255871885.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/25495135349.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/fitiwomazetole.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/35584107917.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/lesogujidobumetepavufuj.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/bcae08b408e8750cb512569246ca1dc8/70130430104.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/75891461343.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/75181925156.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/73658970891.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2e4420818---turatinizabifegax.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/68123679968.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pazorulilaropavuwatut.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/tudaweduxikorulegejomanob.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1248f2f548867812e5b2a7aff7ae9a27/67954966339.pdfIn PDF document text
    • http://altinay-law.com/images/file/59643691672.pdfIn PDF document text
    • https://hinaweb.com/upload/file/51752231204.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca8943284---1632795998.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/71491427789.pdfIn PDF document text
    • http://mamitobe.ru/files/file/90897755913.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/wovibexa.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/xajipamaxafilezujeju.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/13003787901.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/m4qg97rtobihep2bnic9gvvu9o/92310369750.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_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 17036 bytes
SHA-256: e27c73db3e3b2b7f5a2c2bfa9a536cafd868cfc940f637068fc91fefce53bec3
font_01_sfnt_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FC 10344 bytes
SHA-256: b77de84e58fce117fcce787cc497f1e1caa874675bf1fdf2e3ec10931c79f565

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