Malicious PDF — malware analysis report

Static analysis result for SHA-256 b613824528196e32…

MALICIOUS

PDF

88.1 KB Created: 2021-06-28 01:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e22964b7e3dfa09bc217efd7ca859262 SHA-1: c6037b949f27ac46b5fa6b93597ae869f5ba4551 SHA-256: b613824528196e325e4b56b2703011b932693ac4df2f56b80fac957884c83701
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous PDF files hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The presence of these links indicates an effort to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e32283f36---soforumivuli.pdf In PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/54edd1b09085b56dc7845075b1425e8c/masesodemifonutudaz.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb80f4e9f1---4479909565.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6dcc4b3ce---jajadog.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/49b8ed88f8c28ede754b2a97e33b70a5/mofatugudegagofidapuvije.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/03dc05a4d53f607815a5eff245f565f5/gamujufokelizisep.pdfIn PDF document text
    • http://apsons.eu/files/file/xevutagijumariwexowabi.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/1596347337.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/70736a0dc6d96f25192d1f6b88e029ee/44265774017.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/70668179236.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f855e1ac---69830584549.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/nukugiwizojozufabe.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ardvblemht4e4clij3cnsmr0c4/29956503976.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/pujidu.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/c302b9a9f0a49fcb3fbfb315022ca7d5/livekavelirepizevukub.pdfIn PDF document text
    • https://anfauglir.com/images/file/1918350737.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4771520c535cd74f667f8c60423c0442/xofekuz.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/47353664654.pdfIn PDF document text
    • http://erex.hu/upload/file/senen.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c58d898b989---vosenuge.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606df7ae74508---45955412930.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ghbd8gcupe273mp4umsjkn9la7/sodaxaz.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/4cf5c30063f3594a0c52db3735d2d278/jokadowiturafenuvorejode.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609335a6ece64---funugakobujago.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/d255bdfc6aaa5c903017c81f4c99d752/16163693535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+does+dog+water+meanPDF 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_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 16796 bytes
SHA-256: c14e20c2a34915d2fc03e335409c100994aaa9ce7f110db378b764bc2ed046e0
font_01_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B47 10636 bytes
SHA-256: 042b650da64b035fcd9540bcc0aa99b11d70116b587566a629de410969d1b41d