Malicious PDF — malware analysis report

Static analysis result for SHA-256 255e5a0c1351790e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 23:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 40d21307ead6dcf09b6e19ea095a383c SHA-1: af2524bb8fe312b3142e54503d81e9f6a130aae0 SHA-256: 255e5a0c1351790e2be103b1b6f2dab7ce49ffdb3fc6d9157a40d52d677a1783
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to file hosting locations on various websites, including compromised WordPress installations. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ML_NYX_PDF_MALICIOUS and ClamAV detections, strongly suggests a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wirtrauenuns.ch/images/file/tamamodozuxek.pdf In PDF document text
    • http://eunlocker.com/Images/Editor/file/12488091434.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161413c029aeff---rasipeduje.pdfPDF link annotation
    • https://radekslodkiewicz.pl/files/file/1631345148.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/91510293758.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1369b88ea2e80fdc6c63d31051fcebb8/74695111207.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/bunujugizikovebotodimi.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9dcef47e---93176808073.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/dosomemavosafubowim.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/xulaxukigolilobadoxivupi.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/95418893326.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/zufizadupasezupel.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/21279836161.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/jujoxigirol.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161324d2470287---76221224454.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/31832849648.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407e39ae9bc---damijeti.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/27182635501.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/kukirezigobib.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/42328106723.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161418dab1ad6b---tipefibajofuroxexunu.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/boxezotutefumomeduri.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/munekopimetifa.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/45847721433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=vidmate+apk+download+instalPDF 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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 18040 bytes
SHA-256: 6424aa04c58ebdc4d301dc52059ff412aceda23b61a34b0a115a6b97f5ab982e
font_01_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 10600 bytes
SHA-256: 5f5c7fb8689490b93e743fcb436473541e7e2b19c5bef9c7ecdf73c957abfac9
font_02_sfnt_off00012827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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