Malicious PDF — malware analysis report

Static analysis result for SHA-256 81925736479dc861…

MALICIOUS

PDF

77.5 KB Created: 2021-07-09 21:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c685eb9e7455f3f19f83415be5f668f SHA-1: 856ef7cc4982f1581b41f87df973bd13ed501374 SHA-256: 81925736479dc861417e744d9ed4fd3c822bbe70dcd9d3f580cb7e5b3747e6b1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sardavetri.it/userfiles/file/66935259793.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1cd6908b222322b261b391cc9929989c/mowovovazobigo.pdf
    • http://aexpress.lv/index/images/up/file/wotimuxubu.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/006b544df1819a1e3017d470b7e47ff9/26353757842.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160731657986b8---veluvusoxotu.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2ecdfebf---jexurokizo.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e8cf5ab3d---54526790118.pdf
    • http://targdenunti.ro/userfiles/file/gamowutikexika.pdf
    • http://maychamsocda.vn/images/userfiles/file/gimiji.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05cabecb9---pipenodufuluba.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e4c1f07ac97172db86c52481d85ac347/dopobavo.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/341ce3e8c75c49ebe2e9f7e209664162/sogokogukabevoli.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946150b27c0---84401641450.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/72f56e35608a99883a0de0921af1fcc5/nawodabonexaka.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/di15i4hja7g123rp8o7m9l96u9/35029426678.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160909fd4e0050---76800663889.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608a604fd78ed---saludomezegefogozubawoja.pdf
    • http://whewfamily.com/clients/12004/File/18607497492.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ca73ca12---sowetesebabadexutetadu.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3bda8802795d4937681db6fabf334f82/70582316459.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cde9ec8a439---kuxezoxalagobavot.pdf
    • http://clingac.com/d/files/vezixal.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ffd93889---55861573814.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mcqs+test+of+ms+excel
    • 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_off0000cc77.bin
e4f2eaa5270211ea2463bb512e31bbdae33f2016621f9dfe5208230393f525f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC77 10280 bytes
font_01_sfnt_off0000e3ae.bin
43c9c32a22bf5e5adbec1cd5ca136a0f3e5543c48cb1f516c0cbcd796cb4705d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 16796 bytes
font_02_sfnt_off00010f5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 16792 bytes

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