Malicious PDF — malware analysis report

Static analysis result for SHA-256 e680f874e9abd954…

MALICIOUS

PDF

86.8 KB Created: 2021-08-12 16:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f2bc018a395a6bde07060c31b800d63 SHA-1: 0e3d247cd4d4ee973f60d3f939bb78770a272e90 SHA-256: e680f874e9abd954352e03a773a5b69166f6654127d2e4720e475b8191d109f3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, including one pointing to a raw IP address, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://latework.cz/soubory/tijodorifukolataxuxaxuvop.pdf In PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/voret.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076914e2e5c6---xuvigekigiguz.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/baluwatavemegabesalanob.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/dimewidupa.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/gukefofifexisoxe.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd3d9f597---3801241165.pdfIn PDF document text
    • http://huefpdf.org/upload/file/pejijizizezatanuwol.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e020220d28---viledosoxidegow.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/19683144556.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fab8255b81---58392553801.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/rekixapazuxul.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/64580615722.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/99436898648.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/mozisidifaxesuwasevazo.pdfPDF link annotation
    • http://ipceurope.com/assets/file/63819136720.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/14270980713.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/bokaririgelalojuli.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3216682ab1---vozeraroxulujetefijidodoz.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b2da6df729bf1c62a03a78394fe4919/vexenofip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=difference+between+amorphous+and+crystalline+siliconPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/xonowazapifixuweminovales.pdfIn PDF document text
    • 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_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 17504 bytes
SHA-256: 115b78e20d1c060460ece42f470b4b0144199570ae55344444be322deee4e8e4
font_01_sfnt_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 11328 bytes
SHA-256: 6c7a9c680212f3a92e4fc851ef15a6b84d2664f5605b8fb09e4181d2bb101b51
font_02_sfnt_off0001348d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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