Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfd4df10cc45cc5…

MALICIOUS

PDF

92.1 KB Created: 2021-07-08 05:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b7f95a7af11b0c3dab5517a20c2792ba SHA-1: 9a5ca1f19d3bd058e036e8e418bedaa2172d9df2 SHA-256: fcfd4df10cc45cc51f9747f2aa919e69d75954a438036832c08d1d4b3f7091bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites, indicating a link farm designed to obscure the final destination. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malicious content delivery attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a2ab60be6c3d791733dd6ef755d03018/31524708561.pdf In PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/73935895199.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/vupowemibu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/90498880191.pdfIn PDF document text
    • https://ovalpolycoats.com/media/kaxirow.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/poduxabilup.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b13643a0003e4097e657c09c11255f3b/katunajiwadefe.pdfIn PDF document text
    • https://angkalaris.com/contents//files/zinuxawulafinidite.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/lofaxusolimapiv.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/lolegesus.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/tawibira.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/8398002674.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/kurogikirejodabi.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/b70q581phc8amc8eb2v69psnrd/vujujunipifotug.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1f322e77---40883911151.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/65753942067.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa4521934---xogewomovukedapigus.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085694e91837---58381977836.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/7529b794d74f8e2434beb85bf8ffde95/76979095754.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/zijevilusasudunu.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8f5d9b978f2952313cd9e4f0eebeaa64/67679201270.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/17981737620.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/aauoip4laa27ema1nriua4g2t7/51502700030.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732a9f31bec---78998835804.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/74452377402.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a895b4dfb---53795696715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ted+2+dual+audioPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 9952 bytes
SHA-256: add5a70c12797b2b8769c844f6e0ac5c7f4880880e0219f95bf201c3d93ac474
font_01_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 18660 bytes
SHA-256: 7fbbd80c005ea1133f80f2240bbb2d13c726831c3c9b642da30b701add8a7026
font_02_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000133a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A0 17972 bytes
SHA-256: 84d3fc1b4da8e9c6226a60b08e6a459175c0bdc3b316598dea08c7656aa9d9c1

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