Malicious PDF — malware analysis report

Static analysis result for SHA-256 50001d01785a8e2d…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 13:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc2f2420d29831f5553083ce2b81efa1 SHA-1: 72644f74da699a42ac8ade6b9ef4a5cf9aaae1dc SHA-256: 50001d01785a8e2d4e2b49109d464bf957f9c41215ba437bd2a74e4ae5669534
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The primary function appears to be directing users to potentially malicious external sites, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://catamma.ru/uplcv?utm_term=manualidades+de+papel+de+navidad+para+ni%C3%B1os PDF link annotation
    • http://www.photonics-science.com/ckfinder/userfiles/files/52004937358.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/55021549915.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/70415492271.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/xisakazi.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/35g718jssnd2a5bjiocas63t47/96081480141.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea9dbdaba2---mirukare.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/nedulibewatajamanabino.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/48513324059.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e3df70063091eab95cb54f4d740bfdf6/tesor.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/54251325904.pdfIn PDF document text
    • https://tl-systems.hu/files/files/zefobadizata.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/40930344676.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1660358a0---50449373445.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/4260d1e9f00ca8e43f7c58acf4c84880/32683715401.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/60239422394.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/78759797363.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7f7530cb---sivimodirefu.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/siwob.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3f308407---41926294582.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4ec7005d0cb9b894b6c0622f3d2403cf/58208473505.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8a8ceb9a---46113277436.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d99505fd1bbaaccfad8851617186be50/41198553105.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/mezesivij.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/24812417069.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/ziwelojefuxaraf.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4b054ce95---nokiwibukebidal.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/movijuvubarudovuxu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160839dc525072---91602769288.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 18676 bytes
SHA-256: 2703e96d0d16e102007aa7861788574da52589a2b1110bcdd71ae897c3ec9c5b
font_02_sfnt_off00012b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 10652 bytes
SHA-256: 8ea0d3f66e5583b1af41a219b4fee46a801b5d3de482e9f159ef2b0ffdf4e250

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