Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a415d995980a1b…

MALICIOUS

PDF

75.2 KB Created: 2021-06-25 23:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c672bb0c82bf1502137ba4290fccfeba SHA-1: 4bd3dc7e496d7221bec3cea1a9594d6ef3776410 SHA-256: 93a415d995980a1b1b0b7859768be1f4e0ce6134572e232bc12e1b3f916065cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to the download of further malicious payloads, suggesting a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/1v17nn2kms7ec9lkqgdpbgp819/fejabumitamitusej.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3b2dcc1434bbea7ec7c02db020023ad0/94388556423.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/42358fb022c272383b319f0201b9a4d9/70338354005.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9722292f77---7073114663.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/71660278424.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889617abab6---rirexirigedip.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210529182207_d0j97f.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6387598950---goxodowolodomogokuf.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f299db5a4---34432287151.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085bd0081ba9---kelaxuvosige.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8037a453---bekomiworenetixatelesos.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/55958935198.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/cd06c637b5857b0d03ddf70148e5d4a2/getogubunamopukemi.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/88815235882.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/mitiseju.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/susapamavowonozifalasedo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a710e05c650---10054510190.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/nomawawulakozegilepez.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160766a1b51c5f---kagizepanixedu.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/79389667859.pdfIn PDF document text
    • http://strandedtattoo.net/file/64185275247.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8ecf860a0---molipibaradujekobozux.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c61770938---27691303871.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/xoroxoxurefiritimes.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa644e99a---51703631390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=round+table+lakewoodPDF 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_off0000c486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC486 17136 bytes
SHA-256: 12292731adfeee621a712478976b6670c2e2c5b6eec43d344fd783ca7c568e8f
font_01_sfnt_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 10344 bytes
SHA-256: a4e921391295f616a99715ffab6a43ff3137ee30f4a2b34f095d6fc4e5cf3f81