Malicious PDF — malware analysis report

Static analysis result for SHA-256 5741ea32f5535add…

MALICIOUS

PDF

80.7 KB Created: 2021-08-27 21:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 321ab88def5913ae872407dbca8118cb SHA-1: 39d52a5c92d6f7b10984da7f69edcaa75aa293f8 SHA-256: 5741ea32f5535addf1072030e24d192c3815775101d4671cabd260e8f01b2b0e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a broad distribution attempt, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/45624717b69bfe50f3f1723b6effb26d/18125081003.pdf In PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/dq439a24ulnm7l1lrfvkkmbq8i/9252796347.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608042edc92af---72637696590.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/11476409092.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60157813663.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zekagudawamezap.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///27549934761.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/125815005.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/50057248960.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1lpef2u65a7qu1dc1u79u7e23f/7047307590.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/12709678870.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c132a215e3---sexokuxarafijisedemekap.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/muwodisiresugezibageg.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/dijunibufeselufik.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7f0369a9d9e008a0ad4d9794b1c01e2/nemiwimivoripibe.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ojkajhkufge3p2eel70o48ggse/rarirafifufojovude.pdfIn PDF document text
    • http://armanetti.com/images/ruronaluwidivoxomuk.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/wegitagebefinub.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/revemopevijodatub.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/fenawowiwavekulalazurex.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161033e2318831---76571100221.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/1fmd1egf9fhr4frmfckl7fij2r/jekizadifenezonipukama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=chemical+bonding+activity+answersPDF 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_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 11252 bytes
SHA-256: f764b5ec14555e00beb89f4cceb4b62a709b75da451cfecdfb0e0c5049b383be
font_02_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 15968 bytes
SHA-256: d378583d51aa803c7cd12688a2506ce28caa87e091094be8af05b046c8697b15

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