Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3e7aee0481adc1…

MALICIOUS

PDF

72.7 KB Created: 2021-06-28 14:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ce62525183fabff9e84ab4a006818763 SHA-1: 48a12c0b317db9b6f03c5690f495eb69eea97a4a SHA-256: fa3e7aee0481adc1e4bc6dd7f274f13d279fbd94b07abe6c68682d6f2e685dea
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c34da1827---xubisogofodisurimiz.pdf In PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffe31cecd---tevizebe.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/rodumuvubesemovivetozovim.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/d17f7e923be431f4f84c649687d8494b/dirarasada.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e51cbce643---dupuke.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/46ea68d244b32837964049efcbc8aa21/rusizopapugewosukamukazil.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/jepuvidujofugubu.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/sefemejos.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/53be5bba618782498bbaa2335573b9ff/juruburusal.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/58939967938.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/3733872945.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160881a3fbf458---36319609471.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/74c0b50e5cc59760686129903ca82e7d/63228467999.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/tapewadumejetelekipoda.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/62354143643.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607681c58c0bd---61614338672.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3de94618e---pewapelomuxokijobexam.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7fa5a2c66eea9c270e77f924a4377ec5/dumozesevos.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/272c942b19bc140de0af87afa8d4f796/3539132988.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/zavikitazorelini.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/verodawurajafokogun.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jovikeridilifubu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ae9edeca---befesekubaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+drivers+manualPDF 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_off0000bc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 16252 bytes
SHA-256: 5c1cef1789f80af0d8b5a23cc3577eccf0fdb91ad17498b89ec4266a235f495a
font_02_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 10424 bytes
SHA-256: 4b7b48f53398aac9ea0ab89de0d8d79ea646927f10409980a8907d788bab385b

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