Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbcb924cb59fc2b…

MALICIOUS

PDF

88.5 KB Created: 2021-07-05 01:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 704e5e4435d2163ff6549a9f33b385bc SHA-1: 83bad0690b8f31ad297458feff99afe2afbcf445 SHA-256: 9cbcb924cb59fc2b942d05e6d6d01d4446738b9694f3fd17fc2a4503c12ef27a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to URLs hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to a phishing or trojan delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=watch+high+school+musical+the+series+online+free PDF link annotation
    • https://jodhpurtravels.com/nbloom/fckuploads/file/78965130388.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/duzuxubewuxop.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939f6e6b3e5---94194516079.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c3f10b3ea6035a1f766ab36949ab6255/susixubogavowugu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaa6e5b0de---69967186549.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b88a6431d4e---31267214077.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7afb06ef86818fba7b06bf7028375a6c/61030839246.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c1155bfc8afa382ef3cf76da4a4ce102/2932790261.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff725a528---37744968853.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/jogonoxezojata.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/49f06947a29469d19e76ec21cd393251/woketidajinagezikif.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/parikukekomuzumil.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/38097033580.pdfIn PDF document text
    • https://ms01bet.net/contents//files/kegatazakebiwurogude.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/577d48a9335356f66c26becdbdfd7d72/71002603300.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a419dfb4ac7---93859780608.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/4768452900.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfj94vbo5hkrenn1gfflee826a/zanad.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d2c3d92b---fofaroxurokexazesugok.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/kuvinudugibepom.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5464e20a90f676644515d3807fb19667/44396666606.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/20517007374.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080b512764c6---dobubadefaxixamogu.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/mojuriw.pdfIn PDF document text
    • https://tavio.ru/files/file/18488927862.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_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 17880 bytes
SHA-256: ea1ecb80a011844baa27a0f3ca987c05fbb9b37cbc165f9c9d10cf88c7fbf4b6
font_01_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5A 10876 bytes
SHA-256: 868d758694e4ed8eb117c252a8efb2e826f0ec2be85a5705de34bba55a30e28f