Malicious PDF — malware analysis report

Static analysis result for SHA-256 daacbcb6021470cd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 14:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 773b59aec8a210d3375a1dcc16951c3f SHA-1: 9f5c6b9d10a99baeca8b72325a68c450aa5f71d8 SHA-256: daacbcb6021470cd3cdeb43e257040672cad1c5b59144a2ed9d05adf7cba53fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links, many with UTM parameters, indicates a coordinated effort to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xtremefitksa.com/ckfinder/userfiles/files/vazezaxol.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/27675760747.pdf
    • http://progettarecasa.com/userfiles/files/98040189547.pdf
    • http://skonasystems.com/userfiles/file/pabakagukemivoxaxi.pdf
    • http://mylivediamondinventory.com/uploads/files/fomokinokenezuxu.pdf
    • https://rtaadmin.mrv-educationservices.com/content_file/files/gufebazonatebumiv.pdf
    • http://tfe-design.dk/userfiles/file/6047721373.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4209dc1c6ceb948c0c53672d38ef7833/60192348283.pdf
    • http://ovecollection.com/royal/admin/images/products/file/49865595097.pdf
    • http://nexxosrealty.com/userfiles/files/sapaxamor.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/11879645657.pdf
    • https://wemservice.com/ckfinder/userfiles/files/rivarisota.pdf
    • https://restaurant-kamkok.fr/img/Data/file/62991120675.pdf
    • http://chromowane.com/userfiles/file/pikexejofafaru.pdf
    • http://houselandia.ru/files/82400798881.pdf
    • http://standardamulet.com/files/files/rized.pdf
    • http://bbfederico2.net/userfiles/file/pipirakelu.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/14691015002.pdf
    • http://headrepublic.pl/images/files/naxurusagef.pdf
    • http://aedjtjdshbf.pretty-match.com/upload/files/depojajejaki.pdf
    • https://9ja-bet.com/userfiles/file/56831799411.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/cf398b2361042641f651c414412e5ad2/setozoparobig.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9258f0cc1aa25f71695d8b1911bbda5d/97857511347.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=windows+7+activator+32+bit+download
    • 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_off0000e22b.bin
14daeab9c8845cf1bffd6bce0b8fa8a6fd16e04400e7f00593fbd6047620b75f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 10856 bytes
font_01_sfnt_off0000fb92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 16792 bytes
font_02_sfnt_off000113a4.bin
a053bafe30d9d7ecd46f5e2e391d59606cb8f1b474b6320172049d84ad2f5e13
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A4 17416 bytes