Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da0cda1cb175874…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 22:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b639d39732f8e3e164b2cc988bab164 SHA-1: 23a94a845382bc0efb5cbfd01b04c36842dd2e76 SHA-256: 5da0cda1cb17587498a83d8d652c54b2930dbe42bcafe54988f74ec2450417f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms points towards a phishing or credential harvesting attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://15881588.com/ckupload/files/99310351434.pdf In PDF document text
    • http://hoanggiaphatstone.com/upload/files/naxokakix.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/6402091429.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8b70c2369ad06ce3524dc50b602f7c4f/95758267937.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0a02ca0f---dixasi.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/12611501488.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/lateronozaginavelinuj.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/34062632189.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/nejor.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/50676924853.pdfIn PDF document text
    • http://nenorm.com/files/files/jebetumuzevo.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/85496964520.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/muzutubunopakixoput.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/6162452576.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/jozolexokawavelozeref.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143e065ac0f5---kinidokilodawejul.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c80eae1ce5---saboziwojedozagoxofuleko.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/31863700549.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89799135245.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/e9dvfst61mncd9t11kka9617je/zalolodepip.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/baxitemizakowakimowude.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/sulinomiguvavinusajep.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/netuwivepewevupotilafun.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/24685075293.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/vabadodov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=samsung+galaxy+s5+spam+filterPDF 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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 11104 bytes
SHA-256: 5f46fa3dc7aad54a384b208eb77bfb6369d7ba98db2e9ed14985d571506d5221
font_01_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 16932 bytes
SHA-256: dfbc637598398a84921f42059cb3e9824e950b31c64118e47009b67b7ab1927d
font_02_sfnt_off00011e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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