Malicious PDF — malware analysis report

Static analysis result for SHA-256 c996c88f35f71d1d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 01:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e61ba165b089893c10898313b383f2aa SHA-1: 7db0040cb4b10a38ea0180e672dff95c17047888 SHA-256: c996c88f35f71d1dd1d3d09ffdc43a7288b98d27d694cff96d9274d5f3f1aa6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links hosted on compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the presence of a link farm and compromised CMS uploads points to a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad8e885ae---67474624196.pdf In PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/zovatixe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161390fb530061---labeb.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/65957453882.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/74499244877.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/5188108967.pdfIn PDF document text
    • https://sealskinz.ru/files/file/76399273813.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/72987425924.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/18211913617.pdfIn PDF document text
    • http://placc.info/up_image/35661504787.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/34895861579.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907152109608142.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/3814682287.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/65380280834.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/75305432846.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/boxanusawunokowufed.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e8b1d9465f659fa34ec753bbe2384cae/xoniv.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/gupirijor.pdfIn PDF document text
    • http://archbot.pl/files/file/rigewa.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/purefoxoj.pdfIn PDF document text
    • http://sdds.be/userfiles/file/jipobuviriwolidijenubal.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/panabalelevesaxamuf.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/29125932447.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/dulafovoxunusas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+free+ocr+pdf+to+word+converterPDF 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_off0000d373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 10516 bytes
SHA-256: 30fd58f10110936d3f5b30dd3d5cce457701b03dde4481f436de38b60d8e6bda
font_01_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 17220 bytes
SHA-256: 62eae96eac0271441c2342cf5529223cf055015eddff4687901785a86d44937c
font_02_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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