Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2100cd4f415a94…

MALICIOUS

PDF

80.9 KB Created: 2021-07-05 21:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 87aaa75754338c9623a8d215dd02357f SHA-1: 743b1e3c5b2851f74d8075eef6865c1e68447cea SHA-256: 5b2100cd4f415a94f84ac100ac11c71bbc03fa8a4e5cec06d05a03a3eb2ba623
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 CMS upload directories, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and URL analysis point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://baxsporthorses.com/userfiles/file/petewepagaxobivajak.pdf In PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/96804919717.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/07aac6093c539f1ee9df3e821b49c995/92527978898.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb24bb03c60---19024597303.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609e12db56da4---87709899919.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/43828349357.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bd1712198116e3d0f550a5e5948ae47b/larodupibawo.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d98c3fc38---bebije.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbd94a3f5a---totelalomiwanimapalol.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd79ee1739---domonojiboromo.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/worudufivarexigezusam.pdfIn PDF document text
    • https://ocw.tw/uploads/files/pulemabozojevituwa.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/71162083584.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071f57a683a0---38922474925.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/gufudasalivelo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6h59ss47fm8p6ihaf1gq3i27fq/42388328998.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/s4ffmhj3lbddarjjksooivv182/guzarikukod.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/riguje.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/rokejolined.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608017fa9597e---limojetawamevigapikawad.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/6p9ild3sk22bd8bhsjd7kaq7na/9097817102.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/3cbee531091bdca8fb739e606247c838/42784633833.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083513f78264---wevovomudusidude.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7166687648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+silver+way+book+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_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 16792 bytes
SHA-256: 9728699c620e4afccde2b109e1d3be8c8ddd1f6ebabda9f380b437d17fc147bb
font_01_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 10852 bytes
SHA-256: fb07ce3164e8fc98f2b5189f69768916c775f25b30654df4fa8c8a1e4d5f6da9
font_02_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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