Malicious PDF — malware analysis report

Static analysis result for SHA-256 55747cdf25ebd670…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 13:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6c26b271774bf0ffd8fd3b51ce25962 SHA-1: 3c513b9ecef61769c0d3cd8fc7d2518a71fed145 SHA-256: 55747cdf25ebd67052e06293d1717f112e068ecf2d29c22c5a2011ee48114bad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It 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 point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pistant.ru/uplcv?utm_term=top+chipset+android PDF link annotation
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0fe1ad23279f7c970dcbe4c6968f0517/8794884248.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/1396097337.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/dizezetafufuti.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/44766747635.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210907191548.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/99292584616.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/gebuzugorerosit.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16131082881523---sisixanela.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613173ae2ed72---nasinilugotoxinexediva.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/94200116154.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/46602441678.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb40190740---xuvolonefubagimi.pdfIn PDF document text
    • http://szhlfz.net/upload/waxojofen.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeb646ab32---vagejewira.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/71151028810.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fffa196ce---wapinokipuv.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/957cab8547622062c3ba9b7959ff0e22/fivuzu.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/35281335997.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/61952534061.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/bewofexomusiketidoxopizo.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/solure.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/kasutodak.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/12706907436.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/sanemosifelodegikixupid.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/bijuwokomagepuguri.pdfIn PDF document text
    • http://theponghop.com/upload/files/mawopezobumesudogof.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_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 10528 bytes
SHA-256: 4e2963c918a619353387c26fcd252202ac19de4eb4a1f3a65e4740807e385c69
font_01_sfnt_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 18792 bytes
SHA-256: 63de298dfff90a5c987502a6b5189b526e26d99124bcc264f934cf85019c23d1

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