Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef430d30e8895063…

MALICIOUS

PDF

84.8 KB Created: 2021-07-08 07:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5ad2f2bb68472eb7ab6d83e6ae0fd72 SHA-1: af5afb2e6e00078a30f093201a45867459991577 SHA-256: ef430d30e8895063d09270328a7a989f3a8a558e62b2c874fab174692023b90e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it directs users to malicious content hosted on these sites. The PDF's structure and embedded URLs are consistent with phishing or malware distribution lures.

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d72a5838d---38804143122.pdf In PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/54649272431.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e999545becad08500a8834636b2ee22d/53270868343.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2be74d197660eef1150c5d14a46ce078/mowir.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/635c805ec2fa185db95100f54edaa889/tigixatedaxuto.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42975db6d---towoxotomipufowukabat.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/bi1grc0h1kae1cmljicahpd0cs/20810826457.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fe9d34d25---26919315334.pdfIn PDF document text
    • https://codecs.roimages/file/fivewudomuzukofib.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/jagelipijilo.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/ravuda.pdfIn PDF document text
    • http://nprofit.hk/userfiles/guxizej.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/bdf9a2dd25e37947fdc042d9407eab64/93999999707.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7800dc4a7---safabojatagolaregaleso.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1b0d3ed7150c31b4296578e3f8f25472/vamixidefejegutejurilitul.pdfIn PDF document text
    • https://goodline.by/userfiles/file/senokesubizizixa.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/teretubavumivozasakefin.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/livapoge.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1463a1bcc67546b26c3bdf42333d360/85738084453.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/runik.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/xatavajula.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/nawop.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/41876276049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dairy+project+pdfPDF 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_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 10540 bytes
SHA-256: a268f6978ba23fce1e30ef7e9aa24882f5b15cf87998d11ad3f2fa620eca4fc2
font_01_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 16680 bytes
SHA-256: 9118e4e748b71d7fe14dc4918d6bee97dd7f67e10be9004cf6c26ea27e95ddbd