Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fc430bc4f2e702…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 08:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d3337f8f8678818c4786a7c9fb4669c SHA-1: ae713f8800da2ec2b0fb166ab71b745308e798c8 SHA-256: b9fc430bc4f2e702b5738953523503b8240395f48310f2768a6c7bab7dbc6165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=sirion+2013+manual PDF link annotation
    • http://dongphuctqueen.com/upload/files/mazokevarinipidir.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/p0j22s9o9fjke47c0o4tom1kf3/segobozupaxavimawilijenod.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cbc4a0858---sadegodimekamoki.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/jufizojijawizaboganu.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/62937192776.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/simaleporerapupam.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd45a46501---61596355123.pdfIn PDF document text
    • http://effektfilm.de/files/file/xatututanekemadunevilo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8d4953900c11f3314dee9562f3858394/nabibigib.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/66212136709.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/15943532841.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5420a2030d---famukigujuj.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210827124827.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/1921693068.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/50ddee738a79260312945e3ec27d1342/67145842995.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161083b696815c---53776321072.pdfIn PDF document text
    • https://yuss.it/file/62136811302.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/xufunabejibakivesison.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/dizomavedupigorumi.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/mev5261ii0fj2vrim5vakqcm58/tinodavumo.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/45605883776.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/6774254ed7f9f17d65dd669f27ae3f66/75007025238.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc9becb029---1975287496.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/17847230208.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_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 18632 bytes
SHA-256: 1c95f6c1c034e7c73d8836cbf3e691bcd7cd3c2a0c8f8613f152975019b80844
font_01_sfnt_off00010773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10773 10512 bytes
SHA-256: af2f8287f1088d376b1474a2893b45edc7bbd3865a24d5a2bfd76af4eeed74b8
font_02_sfnt_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1