Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6e72cbb849c825…

MALICIOUS

PDF

77.0 KB Created: 2021-09-13 09:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22e449a34cc1fa6a46c61514995eaad5 SHA-1: 12c9468276ad8def081573c7759ada6958e64988 SHA-256: aa6e72cbb849c8255247239c1e341b08965b70c1aa76ce84415a3596603233af
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS uploads, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://evrokomplekt.ru/userfiles/file/34499894447.pdf In PDF document text
    • http://www.deco-interieure.com/userfiles/file/vupule.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/pixapuxelujegawopi.pdfIn PDF document text
    • http://all-premium.com/user_file/files/54437868603.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/61910588410.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ba90ac68---dopakemarabitu.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/vafelazajigixudoza.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/52116071724.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/61099666075.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/clr80e4bhbdo7r6fbe1sl5j51v/33269058531.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18b4996ec---vezikoke.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/49004994832.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/lefesas.pdfIn PDF document text
    • http://soc-in.com/data/media/files/daxexut.pdfIn PDF document text
    • http://boldogelet.hu/media/91760328819.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/69718762729.pdfIn PDF document text
    • http://watch62.ru/files/files/vilixiguzozizug.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/wugevo.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/kowoja.pdfIn PDF document text
    • https://aksusu.com/upload/files/69233838637.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/46705059285.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/2256065151.pdfIn PDF document text
    • http://warehousetraining.ie/images/sekogupogetometiti.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/98978433006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=anime+app+watch+offlinePDF 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_off0000ca00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA00 17104 bytes
SHA-256: e9118d7fc3448b77849eeb48d8e28df94ca0c720378d7c37d4b6590a5e93efdc
font_01_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 10544 bytes
SHA-256: 0cf3922c3211b39af6828287572e4cb0481f514b5303ff8e4630533a3347a284