Malicious PDF — malware analysis report

Static analysis result for SHA-256 440b00f0e9b59aeb…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 08:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d49e00720f0e971dbe2621461903474 SHA-1: ef4709340fe16a6c99e230be5bc9739783c649af SHA-256: 440b00f0e9b59aeb0da3f45cd9953eb33dd732f16eeab479002345f8b7acd303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=planet+of+the+jellyfish+full+episode', likely serve as lures for phishing or to download further malicious payloads.

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://coretry.ru/uplcv?utm_term=planet+of+the+jellyfish+full+episode PDF link annotation
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/30504076945.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/jopavinixuju.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160894277d9127---kiwogobivetoko.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160809a75e75e5---lelegubejepevofokutibusuv.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210824214412.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607228ec0f2b8---volekezaxabe.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/16797103161.pdfIn PDF document text
    • https://ikima.fr/uploads/file/jagaruxowarawugodiwen.pdfIn PDF document text
    • http://mebco.ru/images/file/norekagakoxozolel.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4fcc477f037f7e2ea42f991def3c3042/47631194819.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723e2c9814d---27854044952.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/9eab24e5443a677de36f6d6a3b2f9b4f/53059855212.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f24a3bf8dd---63148223219.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/35854773191.pdfIn PDF document text
    • https://arerp.kr/data/file///37856565361.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0af004a986---98933528095.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a670489a334---dutusizutebitorefax.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/lorubobamevudu.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/2da9ebee839cb7e5068b1882cb734243/sijavixekopawolap.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7b6e0bcc45997c3c89acfcdf8aa774fc/bufekorirofo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3b858b68d---34151445284.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/51278010079.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/mamamifasefirimive.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/acabcb67203e1bdd6b6123e40e191e2c/siwatatelunisanoxof.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_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 10840 bytes
SHA-256: 2e2e8fa3698963cccffb20b441044803ad3a5b482f1b07f8cfb5b6b4c37b91c0
font_01_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 19508 bytes
SHA-256: 22cfedb6493fe1a2e3624c4024bf2a401b061bfe5b1137e54d93615b15fa0345
font_02_sfnt_off000135e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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