Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5585f950c6956ad…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 00:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 707b79118d07d17c13558d7c2a12cd63 SHA-1: 8da48ffe9aa3296e64a3ba7a55f05ddf50009af9 SHA-256: d5585f950c6956addf979f0fba25262fa98df0cc7189e1de4fd5d70bd4791201
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=easy+english+learning+worksheets PDF link annotation
    • https://sesconbs.org.br/ckfinder/userfiles/files/47515623826.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/50610555786.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/tuf7hlh62hgt95vaa30fr4g7r4/puxiferas.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/dihle5a61ml57bk5t5uvqe3d79/bemerowiwupomufe.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eec718c6e5ed81617e32fd5c92d6a2d9/titimixaregifudidipimo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/q2l8vk9h4efcf09do98f802kgd/wokapad.pdfIn PDF document text
    • http://ligneus.hu/upload/file/78566138562.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/majosokowelimemijofanoz.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/runawuxaf.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090812ccf4c9---rokegitoti.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/9202277550.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da63d2d73f2---24348438172.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/letivunebobumowexago.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/potuvemikidonikogage.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/92565885637.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/28489454051.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/53215908947.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/m51facjb1cifr3slffigsh7quo/60616197503.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d0f87caf---malep.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3a04f4e2---jalizuvozofobu.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/kolosefurutolisodenu.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/67247743137.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_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 17756 bytes
SHA-256: 9cf7153ae5e238e4dfd70ae22b3aac4418ef1f0b00cb2886524e0fdce3b03fd8
font_01_sfnt_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 10660 bytes
SHA-256: 0d6aaf42d2cb9746e62bdafe9227e44b6d325c5345739366bf07b919ff87fdec
font_02_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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