Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f581551649ff23…

MALICIOUS

PDF

77.2 KB Created: 2021-07-03 03:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d30c5ee716a5355bce19c6e4bc95a113 SHA-1: a14388a30ea8f0034367dafb3b9fdb35bf8e47ac SHA-256: 19f581551649ff237e07c3e87db958a304ffb288bf9f1b821d483c29d1d6ff6a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs that point to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/808b4a768308a3c9c1a1a0238ba086b9/xojadisimesovesinoz.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609450ed4f4df---62285269459.pdf
    • http://zulassung4you.de/bilder/file/14845317126.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/8a87e5461695b9ce8eb8ecc03005e72d/4484307647.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/328bpns9563m6cg2k2o93rn906/7012576928.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/42dd7521053d83bf8434eed43c16c22e/nisimidupif.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086510b9fd97---26663577253.pdf
    • https://tonwen.org/userfiles/file/lokipo.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077549bacd1c.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/2b9m9bbt1ek7lod8em1edjnt7j/pazozarudesofusedera.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7k58mu230dogfupk0gfbo95iv8/pozeke.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d851e5038ed---13575589141.pdf
    • https://www.tunnel.de/files/uploaded/file/jubowozuwog.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/dfp3aqtqpp81iompcuedvp8p04/91160433231.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095030dddd96---95472605338.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e9ca22b0---30193345469.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eb6b1a702---87148735670.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/xubesitinikikuwopit.pdf
    • http://citywideok.com/clients/75789/File/20124124581.pdf
    • http://agcslohian.com/userfiles/file/76986570131.pdf
    • http://cuakeobinhduong.com/upload/files/1072134720.pdf
    • http://ccswcd.com/userfiles/file/84225501720.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/3ac9692d64510a128c5e1b7aff865cf0/56201009354.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=probability+function+of+x
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f69a745365---danasozajekowozobepoxopop.pdf
    • 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_off0000cafb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 16792 bytes
font_01_sfnt_off0000e312.bin
a77ffd9e4ed14bd274bf91ab2f9aad553f89a1657d3c7ec62cec7c43feac2047
pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 10488 bytes
font_02_sfnt_off0000fb0b.bin
cb510274f64da63c7998f79099e0c7bb38fc4f59063d6a21f66c18812b3acc99
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 17044 bytes