Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c3843237ee381f…

MALICIOUS

PDF

88.7 KB Created: 2021-07-31 11:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7aaf3f107f90229d1b0c620a1c58a22 SHA-1: 24474e8695c1932f5574ba45ed8184d9c100fdfc SHA-256: b9c3843237ee381f47b788a1287edd3155679d90279d7321fcb4d2cf5a8df2a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised CMS uploads. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://graficaeformazione.it/userfiles/file/55263293488.pdf In PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/52467077617.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a446bacd4---73110538817.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/rimadoki.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/71046303588.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/96aeb8447213f703df058b494631f190/82419903981.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/4eubdj6aehoil32mi9kitlapn3/30821392101.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608440c36f670---45329965419.pdfIn PDF document text
    • https://medius.sk/userfiles/file/xojaxumajav.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/lupazirewupujilawuvoven.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/68856093790.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9ecc8dae9---76178139633.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/92609527248.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944cd99429b---sirorunetajubodora.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/zefadob.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/wexiros.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/nomaveromevejatezuxox.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975e3238585---jisodidavasonisij.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845c8cabdb---mafadosomiru.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a59011fdfa---jejupefufatatobawaveguru.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7d6419f4b99ae6dbb7ee17fff3e7cf80/79428842583.pdfIn PDF document text
    • http://lactopad.com/uploads/files/96496384923.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/55582460205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=printing+press+dbq+worksheet+answersPDF 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_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 17348 bytes
SHA-256: de13e2fe1cdb3eb399c32c416f212a13a41c9416b65f343ab91dc599a4c6acbc
font_01_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 11088 bytes
SHA-256: 4df9accdc3a13bf87d9a63278476c86810d54b9f28900cac642582e9c21b4d6e
font_02_sfnt_off00013bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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