Malicious PDF — malware analysis report

Static analysis result for SHA-256 594299f136726172…

MALICIOUS

PDF

86.7 KB Created: 2021-07-17 13:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 20c47ae4062d2a0d0107c3bd07dd7a88 SHA-1: eb2f33ee95ea98cb5770460d4645a9f14b564e00 SHA-256: 594299f1367261722b739f9293723398af5c50e3140b5b7d319951b7a6e49777
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress upload storage, indicating an attempt to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the presence of numerous external links points to a lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://msamerica.net/clients/873634/File/tumekukagesakipezuge.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35d12818a---98849131205.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/zalemixutexojitoj.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/2211767251.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/dba25f4t0pc757tagma407u7oq/837488338.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/havpst6r9eimdhdlf7m6tbob69/vujepixofalanobowapib.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead797927e---87544007960.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/22182975066.pdfIn PDF document text
    • https://sanidom.pl/img/file/70706448656.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vnkh6n4m00lgv7nu00mfse93d4/sasomuda.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/4u89brn064k2t9k578bkvdosd3/jafobu.pdfIn PDF document text
    • http://goref.ru/files/file/68868849825.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sscfrl8oj0kh14mpnfuj7c3tpl/mozazipirosukonorepu.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/wupowogikal.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/4774966134.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/pe1li421n6ejh2fflut80af3mm/91555406165.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec68cf1de0---juwixulisasuguvekavutop.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e59380cda96f436c85a0353b63fe64fe/sibasojatevovukojularomi.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/36018375275.pdfIn PDF document text
    • https://premium-house.uz/images/file/59569023478.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/pexajiraketunu.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/43074689037.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/526910b7380caa9d66b36421d3a01cce/navafub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=99+motivational+quotes+for+studentsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7c3a71c67---nurob.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_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 16912 bytes
SHA-256: efb0add84ba0873164e3100570a276b0e086679a97102ea752784601ef68b133
font_01_sfnt_off00011aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 10900 bytes
SHA-256: a538dcc88b55fd615f5eabd3588b0c11c2b0786e6956916333fe47a12d34a32a
font_02_sfnt_off000133b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1