Malicious PDF — malware analysis report

Static analysis result for SHA-256 37824657a316beae…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 09:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a738e0c9c79233d49c68f15324e1c5d SHA-1: c245018e3aa2afc5cc63e9ea0b51b904b9cc9e67 SHA-256: 37824657a316beae5d828ba0c750be4b874d4c977c5e1accf7868197c9ead5df
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and the presence of external URI heuristics further support its role as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://congchunghadong.com/uploads/files/korigemuwavusexuvetapiwa.pdf In PDF document text
    • https://aokman-drive.com/d/files/45762839038.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/giradopajubutiwinotopas.pdfIn PDF document text
    • http://tyextractor.com/d/files/59961231819.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33762af0f3---zitozefafebafuwumokod.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc991f3dd2cc8a5e826aa02b603d2c1f/51496282636.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/sizegenenal.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/vaxivifawabisigud.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4781200c---53673638477.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/b07jpfojqhuaiedf8e460lud37/duruvigima.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xapekogimizon.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/zexepepo.pdfIn PDF document text
    • https://2winit.com/Files/files/wetujiwabaromupetugil.pdfIn PDF document text
    • http://shosholoza.de/file/ruxupikofan.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/zikuvos.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/kunamawetoguraxufenipupo.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c78743b8abf872bd665bba93e24be48b/10702144604.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ede69416f---30309713635.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/814c38f28b91c8fe9e1f5f2b7d4f8479/2929353043.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/robulejorudusunaxan.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/18138743201.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/lojudopenarufixevifitasav.pdfIn PDF document text
    • https://goldenapp.net/file/65863406334.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160926e92ea4dd---79144860285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=nafta+pdf+fillablePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 10116 bytes
SHA-256: dbba6758d0258f487f835c49b305764a5c60b1e9c47d757e25e879ab72c968c6
font_02_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 18592 bytes
SHA-256: da068da92d779d05a94c92b76a2ab863928b94caefc82515684e6e33fd14d764

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