Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f93f4317aae1d4d…

MALICIOUS

PDF

77.0 KB Created: 2021-06-26 06:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b50b6cf2f4d18aa2aad44855fbe57765 SHA-1: 7fb44bda2e520e18826a5e401f636d15f6fc8829 SHA-256: 3f93f4317aae1d4d3c624446f8f425ae253c1af4308f47df982fa657795bd937
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators strongly suggests an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/n89imj1gic68bql2j252oshgsf/zikibopafovidoremanuv.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/579549fc9caffcc399ae370fb6c1ea37/73834669709.pdf
    • http://sambometal.com/dataroom/file/fobetujag.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bbba0d5efa4d6ca6a0e720eeed2a04ff/45781478447.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d28772160---rezazulel.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/41056074e8494f48dd1a89aa2c96efc8/zomofaf.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece36d2b55---walazeworev.pdf
    • http://studiolegalebisantis.it/userfiles/files/manujumab.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071638dc6830---9288792862.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/dd436cb25fe6dd79285aee7a402940ec/famimubipusos.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a348b7472---kinevede.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/57a31f280b59d96f1cf38ad5d3d5ab8a/kebaxe.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56ea0a398---bemijixowepini.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/h1qgrhq3817ou7tau9i83n6pfl/serebubol.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/23965064533.pdf
    • https://mosallaesf.ir/uploads/ck/files/wudobilotegavuvoki.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/b31a237684af107bead4756c8a3e27d7/65599801091.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6adfa455b0---14582795201.pdf
    • https://hagepoorter.be/files/files/fajexomavudamugim.pdf
    • http://heyumpnd.com/userfiles/file///35562000091.pdf
    • http://www.bluewhaleline.com/image/upload/File/zuxadojuzepej.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/remazowajitefufowuta.pdf
    • http://bagiez.com/userfiles/file/44046741286.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=say+it+in+other+words
    • 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_off0000c45e.bin
b4b0b803c1e1f60f5178cf07d2c52dc38acf549cb51977b02bf2081b162c8eae
pdf-font-stream PDF embedded font (sfnt) at offset 0xC45E 19112 bytes
font_01_sfnt_off0000f507.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 16792 bytes
font_02_sfnt_off00010d1e.bin
11c3cfeeba9e76c84022d5ca00e6595e21e79828024056e9579846201a09a2a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 10572 bytes