Malicious PDF — malware analysis report

Static analysis result for SHA-256 be518fbd1d344357…

MALICIOUS

PDF

86.8 KB Created: 2021-08-24 20:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 40e28679ccca73fbad09afc3af9b8a1c SHA-1: dad963dc86300d5a7fbb0e3dee479d4a06eae409 SHA-256: be518fbd1d344357567699644dec2c6b20362dd3d40f488a18576cd14da85dfd
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, suggesting it's designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not containing user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f5d53a88312e9ae6e2bf2a95421f580/68006394673.pdf In PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6ac1d0db---48210813853.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/xezexopojuminavuni.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856f18832ce---95680828489.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/22825349610.pdfIn PDF document text
    • https://olterus.net/contents//files/sidemakuwef.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gekilenaluzak.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/3146144856.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/34982547d0dd65898dbcda15b3b931cc/xosinesukigura.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/a9b98a293cde7436f1269322ad861713/wobonolozoposoretovorav.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/fatigixabomiziparalis.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ce323d510ec---82695044709.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/vajojojis.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8a929f0c2458c920cb08b44c451b9f6e/fegalavajenoti.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/30936biml21g52mpvpb7quais0/babujefuvekefeje.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add49319249---logilel.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/63432496933.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/fobamudinanupawuwiramebu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/8brie6rurcmq4u7cvsovc449ns/mazasajepasoli.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/2856821353.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/9345811386.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/bideremepevixiwerag.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/317f8qhs9lt2i7ld1h0t26f91l/75467076593.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/78228738378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=potassium+melting+point+and+boiling+pointPDF 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_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 17140 bytes
SHA-256: 788dcab58e357c04f2810d77201e206d4ab16a0716b08c05f4c05d5fde85d57e
font_01_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DB 10876 bytes
SHA-256: b837b023a05f31a34b97fff7eba5947770722b110c09c49e4f3911ff8c5b6f68