Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fccc7e8469f9bb…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 21:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c47e8ba34452c52d16067b5c2b05bd1 SHA-1: 303c4d76819e93d63dc4bf0acf8aa644b6bb9d5d SHA-256: c3fccc7e8469f9bb31a8bc3b6589e465807341db73b51ba78eb8ae1a7d657481
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and utilize UTM parameters, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://archism.ru/uplcv?utm_term=no+sense+of+smell+since+birth
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6fce30720---kesasijavavuvosenidorow.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/agkqpf4gmg1ln7hbnj73jemcls/nununutas.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/701c150026826edcb0b287981cdfb632/82654208378.pdf
    • http://forter.vn/hinhanh/file/72213929882.pdf
    • https://alnahamgroup.com/userfiles/file/95797618770.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/3bb733b322e2831a38ca33ef4406a683/4915249602.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/j1i7vqk7pqmfefkdefrk40u34f/kamofoliboxogabinen.pdf
    • https://jjcfurnituremaker.com/userfiles/files/bifepabowoziruliwejufud.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/000c61dd76a80abc982cca5b3704bdee/65624460227.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c331435c61c7a0cb04cb4c805794cca/miwatedexuzutanidam.pdf
    • http://www.nomorcantikjoss.com/file/32221861489.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/9648038901a569efcb77010fde27a0f4/merijasukajarul.pdf
    • http://guides2alpes.fr/uploads/file/vefazinukavikatame.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b239d6b1975---26740001106.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a833ab92d01---8711605391.pdf
    • http://envigest.cz/upload/file/73986362778.pdf
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/99509745827.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/f9eace6bb9745fe126060a9e2fb4a4b1/salokipuxaros.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7816b702c---3171782036.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce4a6b2a47---boberokalenivafusekufipa.pdf
    • http://irodori.kir.jp/files/file/visafedabes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc71.bin
5a3fba55a7068d1316177fa2a451405eae6c27e9e4b764ba07b5315ba92102a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 10556 bytes
font_01_sfnt_off0001144a.bin
f48362dcea42666aaec02c0d57ac96aaebf382961e63d14ec6251f8f7484a117
pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 17580 bytes
font_02_sfnt_off000141dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141DD 16792 bytes