Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac62eed0c1622173…

MALICIOUS

PDF

87.2 KB Created: 2021-08-01 22:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da179d7d16b9b534ad24b181a348cd5f SHA-1: a85e57a52bc0eee8c9e20469124f3d09f9dc9a48 SHA-256: ac62eed0c1622173bcc15663a57b8b7740e9484c06044d751f51c9fc888fe412
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, acting as a link farm. These links likely redirect to malicious content, as indicated by the ML classifier and ClamAV detection. The presence of these link farms suggests an attempt to distribute malware or conduct phishing attacks, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/27btahia0c4na56um9r09enqv4/58929091966.pdf In PDF document text
    • http://ciskmv.com/css/file/nixixoxuvirilemekoz.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ki3qi36mfpmh72o1ruejeqn1i3/86728555891.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f83838fa6---nobedejesefugodop.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f8de6a6938656d16123cfa5b6e3a660/pokufa.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/17568438393.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/34715689067.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/giwibufesisobagikisunem.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f50bb5bda63---83720615777.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/bavuwutabogedetinerifudu.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/29652941764.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/jegalejukiledejewi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609920b35c913---23985427636.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/goreruxuxetuv.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/3e1qag8mob1nfcr5bh8a3t3h6m/sifomos.pdfIn PDF document text
    • http://gloexdr.com/wp-content/plugins/super-forms/uploads/php/files/6ff4c47e093e56eef2b48dc93bd6d150/zeweze.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/nurojerodekotadu.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/40109821834.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-11/20210511101041138097.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/xafumolumojipujokazipe.pdfIn PDF document text
    • https://kopari.hu/files/file/napopurinifavipu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c39c79ca6eb7d2acec474c7d6963a572/37830931522.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2001fda84fa092c29e82b77cd5c444c6/5490043507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=is+the+g+shock+mudmaster+worth+itPDF 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_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 18116 bytes
SHA-256: f3752b60d874394e2ac8aca651b1fd23820cadc04ea039269a7afca7970d3fe9
font_01_sfnt_off00011d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13589 10896 bytes
SHA-256: 9f651332cb04a8d02288566d295c361309bb5f5b2ee05dd4a91cdd0de0cf3199

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