Malicious PDF — malware analysis report

Static analysis result for SHA-256 87af9a31fd974d80…

MALICIOUS

PDF

90.7 KB Created: 2021-09-06 10:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8407260eca7752fd37ca1d274fe2320e SHA-1: 00b95a384e0218706042b682292b2d76a2ede171 SHA-256: 87af9a31fd974d802c2e2f18b6a055ae2f06aeffafdd83a0de357722f2cb17d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, which identified it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms indicates a strong likelihood of redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://studiosimonepantaleo.it/userfiles/files/gozepevuvataruret.pdf In PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/28863802135.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/73019551737.pdfIn PDF document text
    • http://amdind.com/userfiles/file/38213427486.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/regugozajozijorer.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/wezewab.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/8eda6024b7eb3a4e1c05151cea572542/52271896993.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a93cd577887e7aa9ccf40e0c3745702a/zirewej.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/narivinajefawufafil.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/58900539633.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/33403538152.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/d9a22420c511997d2df5d153d9a1fb0d/xokapizasobobegosud.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/20437712368.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/973b27f0eaff77d4db4d257661980c75/41285676401.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0451bf3245---beziwevoxoj.pdfIn PDF document text
    • https://rajaunited.com/contents//files/nodanaduzexukamorusebujo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/meojhgs5vie11frqi6eb6bn086/24624373146.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1566c2b7---59700917815.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/tamadapiwobopilofebuz.pdfIn PDF document text
    • http://szcftz.com/upload/60889041407.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748c6aeb373---jenisaruwamafuvodazeparit.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8daa83b13---birad.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/00r0blhl7f0od5scfghlptq0qj/ritiwetazuni.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8c0f0a7ac---serudekemanomoli.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/90b8ec590ea68382fb7c2a4151c140c9/92361022192.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/76321488196.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/89979738410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=honeywell+t6+thermostat+manual+pdfPDF 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_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 19252 bytes
SHA-256: 4e676b2fccfaaf4e5e7f805995ec3961f957ad57c2763be0c88c34a700d72037
font_01_sfnt_off00012abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABC 11132 bytes
SHA-256: 666ee77cea77f860289aeb7d954af7615c428c9c52171d96cad834d2e8d5b2cd
font_02_sfnt_off000144a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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