Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4129b6d0dee98c1…

MALICIOUS

PDF

87.0 KB Created: 2021-07-20 06:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32d256572a671ca55b7b8a0c28514077 SHA-1: 0387218c6f5332958a187b4d29f63462b0cd6f3e SHA-256: b4129b6d0dee98c109fa0fb538269cc9621a8321ba744648bc592eb36cce1a81
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://myphi.biz/nbloom/fckuploads/file/wivexu.pdf In PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-4/20210504145903853775.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/34399329794.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/49963687428.pdfIn PDF document text
    • https://senhewood.com/d/files/5453612676.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d79f5b1bc8fb4324d6287f9125f3691e/24331402486.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a010a9368ea---wikotiban.pdfIn PDF document text
    • http://mfahk.com/upload/files/54265567792.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/10466843928.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/52011170963.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/wabokixut.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607086d9110ed---gutukozugiwoxi.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/efd284a5f068e79cf0ac9abe50ffe961/vimudufimesolipevev.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/56a625a3531bb5228a7662a619e986ae/20409191993.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f419032c9d---45776251070.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5ba3e4eb9c082ff79570eb06c61d167d/28833185769.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/dopijufoxivodonovewat.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/59rv6c9t4ftj41ovb8l76o5eb5/98494157739.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c706176ba9---27810664479.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f343a36d---27443584004.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/41814441454.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aeef5b8f2---90514800521.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/79833225177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=publication+manual+of+the+american+psychological+association+sixth+edition+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_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 19280 bytes
SHA-256: 9f38aa41eaedb9aaa15adc7b1846247002d308cf038f19c793f10364f4d0af96
font_01_sfnt_off000118a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A2 11524 bytes
SHA-256: 93f5ffe3c13d25b0cdd25dd832e5c9979020c33d56c1fd4961bc02bb3a0b4edd
font_02_sfnt_off00013365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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