Malicious PDF — malware analysis report

Static analysis result for SHA-256 3035c66f85cffb3e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 11:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79909d0288162015795e51993e549647 SHA-1: 30ac169d8cc8844d183e4a2d305a54c915aa1e55 SHA-256: 3035c66f85cffb3edf8efea36936c116b3f0e890a65ce4437742e7e5091bb314
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it contains embedded JavaScript and links to compromised WordPress upload storage. The presence of a 'Fake invoice / payment lure' heuristic further suggests a phishing attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d3564b8b3aa---zegadavuxemasidiwikal.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/dc1c1cf76acd6378763fbf3f1eb4aec2/bapomujofodidinowopog.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/90150b5ed1b0e4a141fdadbf9663fa2a/xalowigapeporexokapi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f5f5a9fcebfe0525a113c9a390e23813/bofoje.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ede04b80---55164668545.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/58783485314.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c92299b52---lamefowasudixasafagufifat.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/69800017944.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/pokogitefivugupav.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dac7929ee85---86412894271.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ffc97j2ukq65noud15uqedch7c/jazobexupopuvonava.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef3f85a74---75037128452.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/44414221126.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/10056779736.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/rejadepopev.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/tekofawodatopunibavidoni.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/48136963945.pdfIn PDF document text
    • http://rld-carbon.ru/file/11657678755.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/38d6429cc573f1638290abf92c787981/58511328852.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/popubozajupadupodarebek.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4tk4sa7c8p1mu7f0hp7q62rpmu/57837526311.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad2d756e2---zizijegolefunanekufev.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/gitodoxoruxidevodagur.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/nutokadafazag.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/68936905802.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/60568121082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tragedy+and+hope+deutsch+pdfPDF 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_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 10940 bytes
SHA-256: 3e91f9e51b99320427d68e51e1a640e0b5803ceb91f0d036b6d2a8e143aa83b2
font_02_sfnt_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 19436 bytes
SHA-256: 2e8117baa8ca8078a6fed900438b60bebd5963c73fef6cd1012a08d11f563581

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