Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cd4b28321b755c…

MALICIOUS

PDF

85.8 KB Created: 2021-07-25 13:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 109ba877c7dec4a6f6910b4583e96b24 SHA-1: 8a8415d5ead6e0140eab22f895f06dc60146085c SHA-256: c0cd4b28321b755c331b09aa01551a0f9ba2a4dc4df0fac3065ac3a7a0b2d576
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories and disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is heavily obfuscated and contains no readable text, suggesting it's designed to be non-transparent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://abnicum.ru/files/file/fewosuxuwapusudemubewigan.pdf In PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ct2ndkj5j7pnrbn2bs88bvo0k7/45055503518.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4pgc6am2561hinitm6he4k9pqn/gezigij.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/10915182bcaaa3739cc437f4ae10fb84/nuwebasitanitoba.pdfIn PDF document text
    • https://digireg.se/upload/4856559879.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/bamerow.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/898267f3ee52e189be54008c2849650c/mezimiwo.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/nisof.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f4ee1be7874dc91dc3dd4aef1db07459/xubivupivak.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/26374966954.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/donesodinosorofite.pdfIn PDF document text
    • http://olympusflights.com/files/files/jelivakozuf.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160affc27d687f---8060803779.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097fa6d7f997---niwusomatujixana.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/zakitol.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16199439215455.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vacpp55fe20aeg6hbcgbnhmph3/89266288317.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/10703154480.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162206193630.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/1563430827.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806f203304a---15527801549.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/defonuzudusabunuteforalim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=coi+et+cod+examplesPDF 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_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 10604 bytes
SHA-256: 390fcdd8cad181d9eb82f38aeb49f439ccf942d4f0beab7500b05c4967972637
font_02_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 18616 bytes
SHA-256: d02622fc8bdb0961e20bdc3c80ec867ce0abc4f49a2ca9af48593b72cc7825b4

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