Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76f89b08ce9dc38…

MALICIOUS

PDF

96.8 KB Created: 2021-07-07 04:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8d9604068b05578842816170e4e1a4c1 SHA-1: 91b14cfcdd9d26acac6ede7e8534abf8d327d750 SHA-256: f76f89b08ce9dc38a131a80736c0e031c2eb7077c8a98a3b329aa4b9f5e0fd9b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and disposable domains. The primary goal appears to be SEO manipulation or directing users to phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://nomylo.ru/uplcv?utm_term=adding+and+subtracting+radical+expressions+worksheet PDF link annotation
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab845a4d034---viwokewosuboguxi.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/vudibosixozi.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a42143adb957772e7a29954e470f6f06/88112308019.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41f378906d---19876538190.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/f50ac870840cbd808a135a9830fe2e85/bevedopidemezorupogej.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b505a92eeb0---dudivaguno.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/0dd745d4063156c0614b55378d7f6b45/90404371594.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/38fa6ebb05d93797816b37954a87a001/lotavo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b9065dffd---sirujonazodewatuta.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/edvikiai3ggpq9obc0apeslen6/60472837319.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/rowosezomimalozak.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5uetnfm8jcs7dvqt54dscn4d73/raturamukejexibar.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/eddbb3d8560af8e7e3edba5067396d42/4831209408.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/35782069095.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5db233cd---42501864735.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607393463a2aa---renuti.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/tasajubunirufusefivumol.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b11a0bb4f9---83059939386.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ac58deaf101---puxuzetusuwupowe.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/tesaledojepebud.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/95764271045.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/zivogokomimutaxomaju.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea74c7487---naripovurar.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d078c7aefe---zebapusaferapasufujusa.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/vkkecfa1tlahu4dvf0vi1a16n0/gelibuvivapepawesamaluri.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/905680707.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_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 18468 bytes
SHA-256: a9a11b513ee01ef2c26d3e4ac64b53ce8518e72e4086076f6233907e95e64ebf
font_01_sfnt_off000142c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADE 11296 bytes
SHA-256: 00c6982a3af4d1c2e9d910a1a3f6d491f1211d24e398d68b860eca03469ea522

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