Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce68b90b48a6738f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-25 10:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ac32f25a0a3c3001ed7467b0c6883d7 SHA-1: cd488bf8ba56f410c4e08fccd63049af2ad53e63 SHA-256: ce68b90b48a6738f9f31c2311b59b3ba27bb9e86bc3fa774805c40b7b4e7c46b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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 http://mcdanielz.eu/files/file/vovogujabazomijilixo.pdf In PDF document text
    • http://ferrogep99.hu/static/media/file/weragikilewotev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c99b9642e---14755746684.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/fufemitutigapinani.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/befemamefebuzitud.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/i8oqtuirkfl2v37ogun5tu4ag5/zikogumuvib.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/78860922117.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/13670548300.pdfIn PDF document text
    • http://praguetransfer.com/files/file/22756204580.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zudamef.pdfIn PDF document text
    • https://ivanamihic.com/files/83383062225.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/21291792766.pdfIn PDF document text
    • http://tenfci.org/userfiles/file/jemarem.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a3614f9da---xuxinil.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/12963901407.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/jafavowifuzotupafex.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091715221173499.pdfIn PDF document text
    • http://na3.it/misc/file/telobirefeboxumotitafabos.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a0479b38863723b1b03d7f232f1cc081/61936752239.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210904050723.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6d2a92cf---fuvefixabilob.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/wumapis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=tree+symbol+copy+and+pastePDF 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_off0000c718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC718 21800 bytes
SHA-256: bfd95e2cd4b218c99432bab54073cd45b143a10b4a8e6321996702a11aaea035
font_01_sfnt_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 10800 bytes
SHA-256: 5bb94f2b2ebbf4a388e60300abf53794676acf1f5bb39bbcff649df71c43a4db
font_02_sfnt_off00011860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1