Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f6dc970aa8f3e6…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 11:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33bec428165b8d74077913438b307203 SHA-1: 9eb659cdd4972ded5b8e69311f8c553eb35b55d4 SHA-256: 58f6dc970aa8f3e6356743c2b6860ac11ba75c8489934d7a5fb27c4abc45063a
204 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate the document is a link farm and uses a 'download button' lure, further supported by the presence of a password protection lure for archives. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=gate+mathematics+books+pdf+free+download PDF link annotation
    • http://fmdscu.net/userfiles/file/duperamevudetolaku.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/46050816885.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4f3c0677d47590785f2fb251d2f61466/69541171624.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/13031721758.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f7448bdc505---92740316300.pdfIn PDF document text
    • https://bnovum.hu/downloads/63765337960.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e51415786---68990701076.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/67911712753.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/16387941632.pdfIn PDF document text
    • http://primaneighbors.com/userimages/gejote.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/11066970999.pdfIn PDF document text
    • https://atl-50.com/files/file/tologirazisenemoda.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/xakexokogemit.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/zifawaxupikaxajopaxegura.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/86209475362.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/kijakisegagegaki.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210730_65B051326145F917.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/74031150823.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/fa23e0e1943956d1818e34dcd0a4c2d7/jepejeve.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/cebabd071acfb56023636bdb927c8ac6/pasepukobamovenuweruwa.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/dumelel.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea28825a75---fuzimezaretovelojaze.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_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 11240 bytes
SHA-256: b19c41c52ce56b845265c7041ca618ff8b2751a5d7c8bd071b478d027c2bd489
font_01_sfnt_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 17600 bytes
SHA-256: 547dff6c1e850bb10fa49936e250dd8ecf7a824f7e6e1463536bfc0ecebfb4bf
font_02_sfnt_off0001137e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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