Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b83a747a62e7835…

MALICIOUS

PDF

87.8 KB Created: 2021-09-03 13:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82499f7b5f10c9365531f506661d2988 SHA-1: 3d425b2c5a93bb84757c01f5661eb51dbdf56489 SHA-256: 2b83a747a62e78350f93df4763119f5f95b91300364dc18a7ce2acdcb5ee5a39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further exploitation or download of additional payloads. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mywayrtk.info/userfiles/file/netegofasubupazakevamusem.pdf In PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4b17dc39---zedilikujurotolasat.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/75871728767.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/54475205918.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f12236bdc202662c09fbd5ba7ea023ef/2900968084.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/finadux.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/40498934122.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2e25dc508---70890984818.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/65059459638.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/60750438612b581698a80.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/32876356085.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/72352701724.pdfIn PDF document text
    • http://funperm.ru/content/file/domatatizobatip.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f68b24e3671847bb724ab78bcf744ac6/dijejidowusixipap.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/48852694689.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/c96n2b8lg30bljhka0uerrv0qt/94508962123.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8d36fedbd4207b9eebe5eb2028fedf88/ragoziwemazeraxab.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/jebuvetaluletizupatugel.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/fitejagexo.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/29278491199.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/38aqs71r013eb0v4ad2r3ud7v6/99735200105.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/sepabinufugewaselifipili.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tuzixened.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5b3be244605cfac6b5b7eff8d63e630d/99980822609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=profitability+analysis+sap+pdfPDF 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_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 17080 bytes
SHA-256: 50abee08c3a892f505063eb7e58d334bfdbc2903da77aaa66ee878ea8355e72b
font_01_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 10616 bytes
SHA-256: fd1928c4a7b59095f9f726483193ace5b5c4262674dd6cb50cc3d92dfa06ffa0
font_02_sfnt_off000139a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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