Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cbbd6cbefa3362…

MALICIOUS

PDF

127.2 KB Created: 2021-09-04 00:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c416751e7627f60c6b7338e2c4b21c12 SHA-1: bbd694cb0c885aa4063abacb811c61d88bc6f47a SHA-256: 42cbbd6cbefa3362a84c57af02ef4372eec24f8a4bebd1ebf1d75c9f9ef8bf8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://asiadomainstore.com/userfiles/file/porovijomovekoxatefef.pdf In PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/99762200453.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775823c6b02---50938188238.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5ed4d044---7663332527.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf49f314f---13020085025.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vonos.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/dojudigemuwizesafesomidi.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/7ba0a9d133cc2e71aeb1e2b0841bf316/53408230605.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827e01c9a58---koximapubedonuluxubi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e15e0e477---fejuzofirupokabu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/817rcui8ukh6rj8d47pug2vlb6/ziropenoro.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/4571560320.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/kolugaxagelivogegokexiv.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d1de37ac---zajirugokarunejafanufexi.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/50251945029.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/votugu.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/39636830557.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/65679312673.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/84335228460.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/83273752156.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/83463683574.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607312d41091e---tuluvoxavitima.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/22331092171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=morphology+of+nematodes+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C77 10960 bytes
SHA-256: e6febd9ab4353fa4a799c79964d55744d9d0c72d96e5f0157a83648c23ff6a04
font_01_sfnt_off00018590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DA1 16164 bytes
SHA-256: 7fea18684db9c006ea45d7937dd37ee1718786702b7efabdf3570921f0fc13b5
font_03_sfnt_off0001b33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B33D 22888 bytes
SHA-256: 4381edd0148eaff4a2e1fb85280366eca29d39054efc155a14ddf1d89b08b890

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