Malicious PDF — malware analysis report

Static analysis result for SHA-256 00cbb79445121950…

MALICIOUS

PDF

86.2 KB Created: 2021-09-12 23:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f74555a00729744ea2660d65f5bb93a SHA-1: 30ae384b280aebb5259c2ad00b473f52e2f4572e SHA-256: 00cbb79445121950aa0c26ced93abde72890b73dd128e29838b82383b7b20289
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the primary attack pattern involves directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://infrive.ru/uplcv?utm_term=estafadoras+de+wall+street+en+espa%C3%B1ol PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c447a5eafc---podukogugerokelatu.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///xadovezazadurapuzozer.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613507a1c225b---dolakalifo.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/2840059833.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/favuxuroxurazesexubari.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/jalubogexa.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/11875959425.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/32890057974.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/80140952253.pdfIn PDF document text
    • https://kuepancong.com/contents/files/mujosisezumijakabaxujiwo.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/rapefifanudatutamolafurok.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135bece3c77e---74851821684.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc82ca7e2---paratekeki.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/vetagitutiti.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/radedulevezusojiduvuzeg.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/u8af3pk8u7vq7p8lfnf3o17to6/95752012678.pdfIn PDF document text
    • http://becucci.it/userfiles/files/totuposoputikatakakuv.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/20357864910.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/lolumepodetujawigaf.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/95828144507.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/tirakuwosuzaguxotuf.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/19609202383.pdfIn PDF document text
    • http://snft.ro/media/file/74381442474.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 20352 bytes
SHA-256: 1cfb7ac153c1d0a1bee4abd5d94a6c114b823ff91323a5e08038c33d6dc23180
font_02_sfnt_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 10676 bytes
SHA-256: 2975b85a48ff12c6810143e33071991c075efef3f7badeab25c529f464879d8d

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