Malicious PDF — malware analysis report

Static analysis result for SHA-256 b236021eafe12776…

MALICIOUS

PDF

95.6 KB Created: 2021-09-16 03:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a38103f580f6f41607258ce6633ce4f SHA-1: f40acb10e70d280d824c62d1a727b48af3f2e4c9 SHA-256: b236021eafe127769793556a174e92ebd845eee5ecbd333849f1c9822ac6870f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of embedded URLs and the 'link farm' heuristics indicate an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 7

  • 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
  • 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://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428e2131708---50694710169.pdf In PDF document text
    • https://floridainvestment.cz/files/file/87372075655.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/14610620168.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/45053222304.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/xojesinorogunozanatixel.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/34349958122.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/sabozogisonil.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/dcf82ec567d819ccff924abe05b5b229/kulodokadere.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/meposipoluto.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/fobidasalir.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/junisefe.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/37584960485.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jepotezaza.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/fadomifesi.pdfIn PDF document text
    • http://espwireless.net/uploads/file/bamojabedapuratudexi.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3bc135bc6b33c94ef141fe55050515a0/totuwedu.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/nefujif.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/fekejesejuziwaruvotul.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/86598499123.pdfIn PDF document text
    • https://ibericadearmerias.com/file/70823865906.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/41290907175.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9644e24c---rawuferixedekota.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/1a58jcnaob9fth781uhheg7lo5/migumudefixizoxaj.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/18974040487.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630780150.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6dc9c5909b3c6302063af63891a1384f/vanujisubu.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/demamagesuzitupadipuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mobile+attendance+system+project+in+android+source+codePDF 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_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12239 19592 bytes
SHA-256: 7a412f2453e8d47824ecc4b13c24e10b24acca6ce2379c329e32798d4867109d
font_02_sfnt_off00015620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15620 11152 bytes
SHA-256: 3a445ce9cfa9428fd830ff7c9296002d1368aa100154c4c5683ad7f3d2178875

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