Malicious PDF — malware analysis report

Static analysis result for SHA-256 3894ba458e1d17b1…

MALICIOUS

PDF

92.4 KB Created: 2021-09-05 20:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5cc64a145ec744b273ce7fd6e46cbf36 SHA-1: b7d0d18bae54069909ab42c9d3cc9e43ec4716d0 SHA-256: 3894ba458e1d17b18b03a6674ed03e0e6828e58a0f0908a87c0bc9323d725cb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as a lure, potentially for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5666ab571af5dde3fff60180d9aba3fb/gukavomar.pdf In PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/3da52e3fffae1ea385ac94cabc0c5bc4/retigikalakuxa.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/43124074348.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b76282e3---futufalakewigunititoja.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/79756645d63eadbb284542fec10027ff/dovaje.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/61057856294.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/nuvukagon.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e456bd73---tekusufuzozesujaves.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/89503247531.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d534dd83a3---kulafotubaweperezofeseb.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jisometezaj.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/pipawuf.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/56500919713.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/tufafelukofomagatum.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/bozamekirunerejeroti.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/javujafemef.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/kubukip.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/xefigaxosipijanebatekafef.pdfIn PDF document text
    • http://endemic-capital.com/uploads/files/pafumajetojado.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/vemupuzebuz.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/visiziv.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/danenuronimumak.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/lujude.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d288d222c4---metopi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72eef8a674---fuparuresesavevexuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=toefl+reading+tips+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/dilajovutunonupetudeka.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_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 10636 bytes
SHA-256: 41cd9bfd2ff8e9d2233b08c242d27f01584f72d85e564937c5d6c0c26537f093
font_02_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 20852 bytes
SHA-256: 6cb2f005b2dd35292f0b0cab18ed710b3a9302929675cc8247ecef3693384757