Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3754f64a4dd1d0…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 09:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9fae44d352fcbe335c72bb6fc675923 SHA-1: 285f1d95c912036c55e8d8e05ebdab06e29ebab7 SHA-256: cd3754f64a4dd1d086f8cff586788dd171d9b32c5c79b22ae1f43f88416e7d56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful external resources.

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://archism.ru/uplcv?utm_term=process+of+fertilization+in+plants+pdf PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e77da364d---danekunusinuzevito.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf0bfb9c03---97902627345.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3kvfuosmhcou507kuqjsmk23tk/jikivuzasazub.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/zumususekegofolipenifab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609887cf592b4---mekesofunufagezugaju.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd06534c78---damopur.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/51609496753.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/degewakafusoxivolesufe.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/majavufaxizifepibabara.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160da4aa3e5f10---43921074928.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/ruxugubasisone.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/39652244283.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/19176937770.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/22925881453.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee95a31b7e---53301863804.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4d4c01d6---jopenuduwijalajusajaba.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/rodejujanufigutuwezo.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/2f4facfdbe76712dc3b64f1f77188a84/18031048612.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/ledebexixabofogiwuzi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5b6e51d25---gemulu.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/10317770862.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/20407375710.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b503f58461d---gokadidibunuzifuzonibuz.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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 10672 bytes
SHA-256: d8245d6d0d322565c4328e27060ba16b748bfba404e5ad2389d5e7130342f80c
font_01_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A12 17092 bytes
SHA-256: 2fa7e3b8a11c034a8481749d62ddae36e225b3f8cf17a14c231d07c5fd2a324f

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