Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc95f95088e09d3…

MALICIOUS

PDF

102.1 KB Created: 2021-08-17 23:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5a3b91595c4d0020ccb7b4b0a6a717ed SHA-1: a085edfb53ace666da729cd481acf5f307cfdcf5 SHA-256: 4dc95f95088e09d34cc19d15c22e9edd1f623b25ad7f7692c05713ae600f5e11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7d78b4b7---konukujuwarofelasalob.pdf In PDF document text
    • http://commune-bourre.com/userfiles/file/47911887705.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c59b6271a16---73217207368.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/kadikoraka.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/cabdc60289ef431ab642bd63776abd3a/kupefoja.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16090c372a383a---56518353582.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a09b6c3d7---kotabivogotanuza.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4ce28743d8d99c22a805acefb4cc24bd/xowoterujonujenupama.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/23293669653.pdfIn PDF document text
    • http://rld-carbon.ru/file/49929112603.pdfIn PDF document text
    • http://adveotec.com/img/file/81818073828.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/98562671740.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160de00ac9a1a2---puwojo.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021071605543473499.pdfIn PDF document text
    • http://citra.cl/userfiles/file/zerixugavuralugi.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210630113200.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/20549042608.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f0137ead25b7f2c4df092b29569c73f0/bifuvezoxevidokipol.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/zekanoxaxonuwototedujuw.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607988524de38---52038888180.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/36360256748.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37c8962806---46442338636.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/xogukage.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/81319020362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=9.+s%C4%B1n%C4%B1f+co%C4%9Frafya+soru+bankas%C4%B1+pdf+indir+2019PDF 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_off00012244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12244 11492 bytes
SHA-256: 25284b895251a0580b8ef93fc650d5fd2cdf712355b7699d5a28772858d47a1e
font_01_sfnt_off00013d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001554c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554C 20396 bytes
SHA-256: 583cca9bc368c46099e8bce224ba51ca38544db4f53d112773dd93256a6c5ae3

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