Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca79db082dfe4bcc…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 10:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb555391c87a3b982fd9e61fdda53d5d SHA-1: 2dc9427bedbe5d38b0e89370941bdbf7de772187 SHA-256: ca79db082dfe4bcc8f65b1eb7f7d95db54a838f6c4649e5148b161f6f7230b1f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, as indicated by heuristics related to link farms and invoice/payment language. The presence of numerous embedded URLs, many pointing to compromised or disposable hosting, suggests an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to facilitate phishing attacks, likely by embedding malicious JavaScript or exploiting PDF vulnerabilities to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bisnismedsos.com/userfiles/file/molibisigudenamigi.pdf
    • http://lezeckastenakosice.sk/upload/files/vuxujuxek.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/30uvlvv2ljcdj04kbj9m5usmuk/sutivurigidesatatiwe.pdf
    • http://vdadanang.vn/app/webroot/assets/files/14099946573.pdf
    • http://marymo.ru/uploads/files/56108500469.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/595c076204824f91e6b6c647d46fd61c/4614018541.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16074a14319af1---17076940244.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/gmpp4u6un5esdva8319vnhr6p1/paxatuliraraxevivuka.pdf
    • https://mobilieroccasion.fr/uploads/file/72492261047.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cc50d6730fe---340704203.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c5102f0e---miminodovikinumapu.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097cddb8d358---wuwus.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/dolegovoburozikode.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/3d97cf087f582235ffc7e24c63c1e112/43772422593.pdf
    • https://novahealthclinic.ca/userfiles/file/zidozo.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847091dfa6b---wolutukivibakiwupofofifun.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/a27340967eaa6c35035e4f840b232ddc/31304057038.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6jhnaigv5pcottrh3dm9a88h3e/rodukabedagoba.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/l785o28okkmdekh637ll1dgua5/82203448461.pdf
    • http://hitecds.com/userfiles/file/dajebusisamosov.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d377a42ab5---zemewovutopozulomow.pdf
    • http://ahcxdq.com/uploads/file/290845542185.pdf
    • https://cmsschoolkg.org/userfiles/file/mesejezaniwuwonedasosike.pdf
    • https://vipbeachhouse.com/uploads/editor/file/55904341296.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607325fd0e521---72806647812.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/rftpjort8l7qvqaanc23ouujgk/38414340216.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=recurring+ach+authorization+form
    • 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_off0000eb31.bin
0719af52f47271d9ad0ac0e5e8f9fc34f69b2f9544d8b6e0273021c37384dbbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 17380 bytes
font_01_sfnt_off000118d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118D2 16792 bytes
font_02_sfnt_off000130e9.bin
422e437dbcdef031c79bde551aedca2b86862a74375566a2cf35fbc73273a34e
pdf-font-stream PDF embedded font (sfnt) at offset 0x130E9 10772 bytes