Malicious PDF — malware analysis report

Static analysis result for SHA-256 199a67685dab1a24…

MALICIOUS

PDF

87.1 KB Created: 2021-09-07 05:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c69bc59ebe2de6da85f2e501e67dec4d SHA-1: 1fa94ea891d4b336c3c55afc0c349deecd4030a4 SHA-256: 199a67685dab1a24b6c93da7000f01d2bfaec5b399293802ec9a6149743b33ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute further payloads or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.siposferenc.hu/html/9112082149.pdf In PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/72995447601.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/gufafatewevuganudoxufe.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623432949.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9d77cd3fc04d2aae7ce9e59923d5e518/duxobenagiremenixuf.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e15ae9ddf---87798958077.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337088937b2---dusuburikagedosinulaxobow.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16074ced8ccc65---lubulorukebubawosodilet.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607256f53f77f---96966517366.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/sodaxixibajubaxi.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/31524611470.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701239bb776---rugogibozaxasituw.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/52762755084.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/nufezipimax.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/nosovezogot.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160da3da2b7154---69210223575.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1115875b---jivikipuzobuseni.pdfIn PDF document text
    • http://c-amc.com/upload/files/zepisoxi.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/wetuviga.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/totobaxunok.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/kotaw.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/dogoforomawajum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=biomaterials+artificial+organs+and+tissue+engineering+pdfPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/wijikogesuxuvazegesov.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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 18796 bytes
SHA-256: 0f354bb93996af88a52b31b0f264df480e41cfb17c39ee2980d1438647ab59db
font_01_sfnt_off00011c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 11116 bytes
SHA-256: a7a9c4fd36ca40add79fca0884a4f5c8e112837465cd0f402f02f4d904fc51b7
font_02_sfnt_off00013647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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