Malicious PDF — malware analysis report

Static analysis result for SHA-256 a552c24bcba180c9…

MALICIOUS

PDF

88.9 KB Created: 2021-07-30 16:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44a4961dbfe0ffcd149ddb21bfd807d3 SHA-1: df0e26da423f96f2d6f8d5561f9231f6a17f7c16 SHA-256: a552c24bcba180c99ba12f67e72901b487becd724e6f39fbb0cdea19ecb68ebd
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, indicating a phishing or trojan distribution attempt. It contains a large number of external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links implies the document's primary function is to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=milwaukee+heated+jacket+washing+instructions PDF link annotation
    • http://autosklo.sk/pictures/file/rerazesexu.pdfIn PDF document text
    • https://angkalaris.com/contents//files/lolaxozafivowedijife.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/9b60be1e07d1e14f14999367386ded1b/sowubabavizapaxefokos.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/dekokifeje.pdfIn PDF document text
    • http://splogservice.ru/content/file/35285012410.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8a25063d---82031238219.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/tetinodeguroxezomo.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/1f14bb1448a19555be25ea5098bdd77e/folebig.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c683caf238---kekekiri.pdfIn PDF document text
    • http://kleiberit.ru/files/file/89555361789.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/85909588005.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/pokipoxalimudufewejiw.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/nisuraradigaxejupuluj.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/acd14fe89573a367f3c8f7eda8d7ec20/buzapenubuke.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a60782dd0---botukebotegefegof.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde7020dd03---wokomiwigesafomokoko.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/tewobulixapuwu.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/2281135113.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/63054904244.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076006c62fe6---nodurejotezitapa.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/6961808597.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/56029298251.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 16916 bytes
SHA-256: 3dcc9e198550a7d9522192567d4128cc3d4a3faf3b28b2b1be6249d76759b2ad
font_02_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 11052 bytes
SHA-256: 84f86947fbda399fee0779cdb2fcef15233220e1e7ec91b11e4fbce93e38bf94
font_03_sfnt_off00013c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.