Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e16312ced57e8a…

MALICIOUS

PDF

131.6 KB Created: 2021-07-19 08:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4af039c1f5c5cedf275165cc60021235 SHA-1: 4cb53fa96777b2293e7ec12dcc7dba7c2b56eaa2 SHA-256: c2e16312ced57e8a37f3c5c18cf6522237d68ac5b181a73fcbdc5d1bee525540
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9845

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://halongbaycruises.org/upload/files/wipoku.pdf In PDF document text
    • http://brandnewgoods.net/userfiles/file/26373974096.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be0190902fa---30084437120.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/kisosoz.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/guval.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/buvamogijuleze.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/ruworoluwebalujeg.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/lemozuzisapedodiw.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/25911353240.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607335f91c690---88300607618.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2fe6ac549bdf632a40d79157bb69a9a2/5889154590.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4682f39603---91466593045.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b82114114---womugigabizov.pdfIn PDF document text
    • https://ka-base.no/images_content/file/24006427760.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5b8mmt558sokk4l8mm3lq2f4r6/mumolomuzofoxoki.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/25795009387.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160984b606278f---5393748826.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/fimegogogabetejadimid.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/88826444299.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0f56317d0---42265485611.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8c0eeeac2abae002dc3c472bbdf033c/dojubekemovilakosobava.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/lepunenona.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080969ec8cf1---78133697127.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/94055116885.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/99547330012.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6e1124d968216d3b1d147b8522ef1b8e/divawirewivefefok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=combination+of+functions+worksheetPDF 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_off0001a058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A058 17796 bytes
SHA-256: de981d90f8640d061d5d5f534ec538aeb2dc308c520fd955f8ada4b99d75535a
font_01_sfnt_off0001cee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6FE 11004 bytes
SHA-256: 2d366b2056333e792d207369e982534994442e0a586d5ae43f672c48cba9493d

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