Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc73afe6b1220de…

MALICIOUS

PDF

77.5 KB Created: 2021-08-30 14:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7f059e6b1b758a0a41ebd77b5b8e63ed SHA-1: 9a0d8e5c9c141d10055cc4a02dae082784b4ff6c SHA-256: efc73afe6b1220dee0b7f0a11766a6ea6515ac21a9aacbc6b0d43e5f1c74dfad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://queure.ru/uplcv?utm_term=engineering+electromagnetics+by+william+hayt+solution+manual PDF link annotation
    • http://kwong-cheong.com/userfiles/87424287109.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/mosevima.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210510122828.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6e918b60745c7dc64489a369b7d94830/xinuxinibaf.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/zigoropateruzabojokit.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010359066642.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b21f2fba0---33611218519.pdfIn PDF document text
    • http://skyparadisecoffin.com/images/media/files/56061690087.pdfIn PDF document text
    • https://uangraja.com/contents/files/55336520756.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/zamodelemifanarojo.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/189e87dc79f93e7096359cadd8b0dccb/tulowevulodopo.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/791fbbd417decf94f68cb745be04d6e9/wopoxonekafisokonasol.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4dad7212ee---vanagazasudojaw.pdfIn PDF document text
    • https://cristalensi.com/public/File/3607030394.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/e6m3kvpm9pkki7r9aeb49inue5/zumodiretakibepunuxawibam.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/98605507914.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/komiru.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791ede43a1b---kagebepemuzavatisapomubuz.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc0c4d66a---34629201165.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/vewita.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/27854015439.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/32357608004.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dmtp0tbonmfc38hkv13h6j5r1m/51214021013.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_off0000c845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 11100 bytes
SHA-256: e3119ef17f2c458d134d5e76d9ae9cf15366ec5cacdeb6ab3e500be59fb911a3
font_01_sfnt_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 17296 bytes
SHA-256: 19b8766cce37cee958cf7cc1f522d395624f01a1cf96ceb7edf286c24c3babc0
font_02_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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