Malicious PDF — malware analysis report

Static analysis result for SHA-256 25152b686a5efa3b…

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 18:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d926cbbaa2770412b02f1a655194ae75 SHA-1: 737227f24987c9a028853ac88f14044bd8f414dc SHA-256: 25152b686a5efa3b546e865040b2d2031302d7a6906018de9c9373010ef625e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/195420eh91qoqr1q6d7ciso2h1/dasufobetune.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27d43b86d4---wojefepetibaxaguju.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0632775dc2---63471893553.pdf
    • http://blpest.com/UserFiles/file/824960082.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/46ee8931f399ccd147de99c853f1b590/nodidefivugiliwixebun.pdf
    • http://akkoryazilim.com/userfiles/file/12909986876.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982b98d0f8e---tewadofosokomelafaj.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cc67432593182074a6577b1f097f8cf6/4401975577.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/0022e27b9220c5c9bd30221707caaa79/52082279972.pdf
    • http://infrabud.eu/fckpliki/file/nutare.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/88216653866.pdf
    • http://omgmediatank.com/userfiles/files/37897991242.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082611709c02---84324289149.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ror8o8tpup6mlvnpm3o2m1im67/94459116626.pdf
    • https://rieker-consulting.eu/files/file/mobitokusosigifiderisuno.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32280909824.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ot59fia3giqfnpuqo59ab24qq5/91052925292.pdf
    • http://tktravel.shop/FileData/ckfinder/files/20210604_093754CEB481B71E.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/dca3084c15082fea989fa64ae0e5ad20/teporel.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/2f09f3d75da1c74818b83d78ac27ff99/41136456668.pdf
    • http://topenglish.sk/app/webroot/gallery/files/77058919524.pdf
    • http://firanywiktoria.pl/uploads/editor/file/281821155.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f223b033b---fulivinoviwebukip.pdf
    • https://securityguardsupply.org/php/uploads/file/17208716453.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e1c2a633963502376183bef0fe36c830/54838104187.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=names+for+hades
    • 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_off0000e865.bin
19b6137a82bce514301795e6baac792469895b681d2c8613660d4edcb5232b7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 10256 bytes
font_01_sfnt_off0000ff6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 16792 bytes
font_02_sfnt_off0001177e.bin
605b7cc56ea0105470791ad57e575bd2cd0954af3f34637861ed3708240dfaa5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 18208 bytes