Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b603bdc3c16c71…

MALICIOUS

PDF

96.5 KB Created: 2021-07-02 09:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cfd754af413db187bd9cc30740db7aa SHA-1: 15519bf3d59c9c71fd56ae470aabe4d5f66c1d17 SHA-256: 26b603bdc3c16c71693a82eda85097fa6994af763c642a0ce2d896db325d1ca6
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of an IP address literal in one of the URIs further increases suspicion. No scripts were extracted, but the overall structure and embedded links strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767f5e30ce8---57442643684.pdf
    • http://beiks.info/public/file/46035538616.pdf
    • http://usmleworkout.com/files/file/winijizoto.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/qal5kpvk0oh9gi91ecneuse1j7/vorosexisuwusowobilusi.pdf
    • https://fceresources.com/ckfinder/userfiles/files/kukiwo.pdf
    • https://cottonweb.net/userfiles/file/77077536738.pdf
    • http://bixenony.com/userfiles/files/valud.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7813d46371---43898452721.pdf
    • http://chinasoftcore.com/userfiles/file///dezesusumasopaja.pdf
    • http://sanruou.com/app/webroot/uploads/files/56307002087.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c3000d50d---65891162806.pdf
    • http://abwessex.com/uploads/files/13602686892.pdf
    • http://uralinteh.com/uploads/files/37089817813.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609737e41d653---45594595197.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160731f84d1504---wodimopasafedamen.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ee2aebace2ced0caf4ca971fd03223a0/46769889393.pdf
    • http://willbramephotography.com/80452300830.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/28453297277.pdf
    • http://heibldr.hu/FCKfeltoltott/file/zememopufidozivusuz.pdf
    • http://phuocthuan.vn/images/pic/file/lodajataxutiwulu.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8d1dv70fs5pms6g6hp1vpq8qm/jetakawixim.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f407323eb29d9fe21d635f18ab282f2c/bapupatesuvigaw.pdf
    • http://morethancars.nl/uploads/edytor/file/vazuzofexene.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=star+wars+one+sith
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 16792 bytes
font_01_sfnt_off000131d6.bin
2eac3b81eb66ffae5449f7b52acf7ed61d95e6ec3087293c2cd3c37468ed26ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D6 10320 bytes
font_02_sfnt_off00014919.bin
c7d05221700f3fd6119b3625e2c90966b9a9820f9f9ec92a3e7b49291e20799b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14919 16860 bytes