Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c7c2ea914ad4f2…

MALICIOUS

PDF

77.5 KB Created: 2021-06-13 05:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e53c50c671fe21269ad5f00d287780b9 SHA-1: 7246a54117353d8e50a8693359f72b73febe3e0a SHA-256: 88c7c2ea914ad4f22a35303dafb24f4e635f6a515658ce2ed7bd02ec8fde6957
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 Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search term, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=red+deer+location+call+of+the+wild
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/664ee170fe1310c0d4e49ca4d87f3e43/nekub.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/b8d0067aa48bc90f0f2415540a664cf5/xadupuleze.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6c0acda26247356f758edad27c0af38a/mejuvexu.pdf
    • http://phannhan.vn/files/usersfiles/files/54026885704.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160870284eeaad---tonurakewowezurokopofa.pdf
    • https://emilline.dk/ckfinder/userfiles/files/53086470804.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39dc0365c8---mazudevovaxaradenefa.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/6aa0f11c079e03386227c84dcb56d42e/31407812319.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/fdok5ndohje3rq6levvth2q058/nazufixesanugakog.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2de51de869---ferirunazurofu.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160746553a0d97---zoxejurifevijax.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1f7b40d9---97697631622.pdf
    • https://cortopolis.ar/userfiles/file/92139089571.pdf
    • http://yilip.net/userData/board/file/nixupusosumuwezuxatu.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a17f6538fb---75300911078.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea3.bin
6f1c3ca2f74a5ff01d499f91f118f239a2d6dfd2a53df99f2ff3f518aeba4116		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 5032 bytes
font_01_sfnt_off0000ffd1.bin
18cb2dce3901c007e421d895c93a0676ea66555f9774989c3e902308dbffb421		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 11568 bytes

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