Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbca0cd59817267…

MALICIOUS

PDF

88.7 KB Created: 2021-06-25 22:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 37db2b95a92a21cc8456e22c876dd84d SHA-1: b0c94e6a9e42f57d3480267e6f1c43064cfd2124 SHA-256: 0bbca0cd59817267f6039c296c4eb746f86d89ed501960d1de216f8c9efed627
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pistant.ru/uplcv?utm_term=white+noise+one+hour PDF link annotation
    • http://morard-mcf.fr/data/Files/wejopozero.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/98077096182.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/wubojuzosadib.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609670c7bd63f---dupupugojaropewaberatax.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/lk27l52o2era1qjd7t5mnkq3ia/69295513956.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/74fa43e86c92cad5206530b133a3232c/97735552276.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n7si40kj74h3ncqbd5dgtndd94/41561563860.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/56434514664.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/70482350972.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969a05a1590---88083657937.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/f6fbb2e8e0b1e5c8d2455e96a303abf7/62978552396.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/93e5718dce6a5f27360f79dcc9717e11/gexugowisixo.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/26645748219.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/99247912255.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/93415025367.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/radejukokado.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0c9128a19bfdd5dcb0001274f5864fa9/49405151855.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/vidiza.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e7ae269b9fdc5560d3d6a133c0cb5fb9/98505734645.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/jaduz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f1bd192ac---gotibibiwiwipirimudoreful.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210621171003.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/bace3cc8c8ab829c7f3add67757b3483/50768068820.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccce68c832---fifevajigadegavuvararaneg.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 16780 bytes
SHA-256: fc30bb51ef00b0528888b8abac87a897e73c07972a56c3ce3d27120633eabc5b
font_02_sfnt_off00012f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5A 10092 bytes
SHA-256: 826e9a39004b90394d2a8c58a8af3c45eacde92ab743186c1efc3b318876a3d8
font_03_sfnt_off000145d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D2 3448 bytes
SHA-256: a8dbcabd60cfbabb8daa6a0139356ff958868627e3da6284be4ced7f9a891e82

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