Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7600b5a25fb678…

MALICIOUS

PDF

70.8 KB Created: 2021-09-13 23:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e6964991418e538cf0fae91ff653aee SHA-1: 0da95fd5d11526d11c41d8119327af8f6bf23373 SHA-256: 7d7600b5a25fb6782e03818646212b786c2e92329ea1115c41a59e68cc9ab291
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable domains. The presence of numerous external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3f87b423---metawaxovo.pdf In PDF document text
    • http://zatuchlina.cz/upload/file/juwivejipupav.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ed860d84f7b0a937dfe08d52d56faaf7/timabumubanapovigal.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130703621ca8---bimevedekugiz.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/jolixesokomelokitipixo.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/80591409535.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/tefogokifubi.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/suterafikutokasiwikifar.pdfIn PDF document text
    • http://moneymaker-gold.de/files/kivasokapaneb.pdfIn PDF document text
    • http://rinsacars.com/files/others/luzagajigazelidivizonu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f145020e0---gavejakonasumajomami.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/fikoxidenubus.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/91921014944.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/16447219957.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcae9a215d---60665002197.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/ligulobawururaril.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/43ca291813c21b373ebdbf4360488174/xivufekazubekavo.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/nezewilekemimuvijuzibutu.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/lelodetibesonasow.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wijexixes.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/piwipe.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/sazarupovolalujekum.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109040045129707.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/wolewadofikevozidelopogu.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/81615003795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=master+hd+tamilrockersPDF 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_off0000b4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BB 15948 bytes
SHA-256: f690e938ab6f5f5bb840c3d43eddf84c18f48d8a5c3583e249f14b57370b1b4d
font_01_sfnt_off0000dd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 10616 bytes
SHA-256: 6a388d10c2190c61758abaacf496a549871e337fe797b2f4453ccf2f65b88bac