Malicious PDF — malware analysis report

Static analysis result for SHA-256 47db39ff3222a386…

MALICIOUS

PDF

83.3 KB Created: 2021-08-01 07:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd31ce9dc14e12fcbb93176233eb8f92 SHA-1: 3f4635db1602c50bb05efd0cc953d5bd181bc1e2 SHA-256: 47db39ff3222a386a45a0ec667543dc0d2251f826ce01d14c3ccf78e315f5f57
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to initiate malicious actions. Heuristics indicate it's a password-protected archive lure, a common tactic to bypass gateway scanning. The document body is heavily obfuscated, but the presence of embedded JavaScript and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggest the intent is to trick the user into downloading and opening a password-protected file, likely containing a secondary payload. The numerous external links, many hosted on compromised WordPress sites, further support this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e20eaad9a---faxesi.pdf In PDF document text
    • http://raczcsalad.hu/files/42782215741.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/524468365406cf44b056d6214af20452/gupefudobabenipeba.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/64459831080.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/70423518539.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/lizibobuma.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d3133b96f5309ac84d70819369994de4/kilukivonajazi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a481bda1562---9584452409.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/179dc8c8c7ff1790de6d3ccae00f5d86/28950416234.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/kexoxulomasugibilisopo.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/teritewedofapetaselaxusav.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed8368357a4623d229a3ab97b85fbece/wefeg.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ff9c86f25d2dd8a439d0d9d5bb29e367/fubaten.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa3a27a5a---defufama.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/96812092255.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088fa2f97f41---81988685158.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/46844892042.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/20245491551.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b71b3a862f450076e9a0ab549124cda9/10328368910.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/24551236764.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/ririrutasunuwotuw.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3991b4e645---dojadapirazig.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/88929175592.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/nodoxovaxojog.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dd61b2125e1---38747746689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=winrar+password+cracker+downloadPDF 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_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 10580 bytes
SHA-256: 89438968c52ec9d892955916d8ef6f14e58b7ae5f3d6e99abcf9483b61aaa04b
font_01_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 17256 bytes
SHA-256: e9f30fbca50021fea4c9851fb2f352ac5886e73fcf67378f4328cd09aa76e695

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