Malicious PDF — malware analysis report

Static analysis result for SHA-256 311842185d38947f…

MALICIOUS

PDF

89.9 KB Created: 2021-06-27 09:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2219dc0b067b74a4b3b945d9e667ef58 SHA-1: 81534178035b4f5a5d874c4d6c06266775c593e8 SHA-256: 311842185d38947fc0a3eadafd4019a4e35fd0e5691f48b3690b82417a853b4e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support its malicious nature. The file's structure and URL patterns suggest it is used to distribute phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606d118512f38---rurexuzaxefiw.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a6ccc3aab85fb092aadc7830bde117ed/jerarume.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/sugula.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/99370922414.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/fc1f67f764c425733285ea5076083ca1/tidabemanitoxobiwubo.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/bejufedererefulosejet.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608599f476b8c---vuvala.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mjnp9hrpr6f5dbn28m0peasm86/tonosexorofofetadugaw.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/wusepemotigafi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c980410bd---nerinijom.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ce682d7f8---nudijezumoko.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/kinebovozap.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/da13722fe15dce3231b5abb03acaf7af/79188173775.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210614181242154.pdfIn PDF document text
    • https://stvorki.ru/files/file/depagimawukeweg.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5b64jbcudbq4lgkn3jle55shhl/balisa.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/71846158446.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/9087103299.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2b67ca2ee2cd34335a5a57db0c62da23/54847255380.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/sgju314s7lgujq6cfbammrtv4q/vigavikes.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/kikod.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/xipodufixa.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0ab9df8e---suvalamebakewu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b8a2952e2---moradivijubuxukarasudomu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16082920e6561e---tubaperakosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=william+gibson+novels+in+orderPDF 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_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 10692 bytes
SHA-256: 80fa7551a73bc939b1e12a275f4137cc8d2d5dcb63901ba725d3cafe0e4c9b22
font_02_sfnt_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 17404 bytes
SHA-256: 7b1de9aeab77db0e8502946197619d0c9612b2ded979c4927b4e45a2e22d1a75