Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69c8aed8268c78f…

MALICIOUS

PDF

78.5 KB Created: 2021-09-23 18:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c325b14168b908acb103891afca3732 SHA-1: 0f958021f96f082a3798d39079c04859e6b5c5a9 SHA-256: d69c8aed8268c78f657e4221f1d4ab3e06026a516c7a1fe28abcc238436c5b35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to malicious websites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=dr+nowzaradan+800+calorie+diet+pdf PDF link annotation
    • https://dudikom.pl/userfiles/file/71478196287.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/79137612712.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353ce85205f---23999909228.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/buxiboriwoborofonanejasus.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/pibapekusidov.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/217976d3c28417699228aa0623a3aa8e/wubomevazubixeb.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/65982762440.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/19170235461.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/45126698083.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/5991390335.pdfIn PDF document text
    • http://land89.com/ckupload/files/48058116674.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145cdc84b762---maledijotaf.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/zinoj.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/13363735755.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/66147559701.pdfIn PDF document text
    • http://domainecomps.com/documents/files/wasowosimexipukabagijad.pdfIn PDF document text
    • http://teifsepahan.com/files/file/19043325368.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/xarixizedaj.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/56465504172.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/4831766303.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/082310141625.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/manosujerasade.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/63079845267.pdfIn PDF document text
    • 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_off0000cfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA2 16700 bytes
SHA-256: 81af22ea7f6fc419d91c691c71f258df5d57354b7e5295c1013fad6e405bc93f
font_01_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 10920 bytes
SHA-256: c134ae56c6d283125dba5c9e915ca03b149a8d7afc9761f79856a23b7ded90b7