Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e13c3498c570cbc…

MALICIOUS

PDF

70.4 KB Created: 2021-08-30 06:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30c2622fc6f50a135660772b34773505 SHA-1: c02a1d7f69456e0ede49dc4ee2ee5894dbc1e32b SHA-256: 0e13c3498c570cbcb1c24ec9280bfdd4787d0ab01ebb3d61dec6ac1aa4a657cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm nature are common for initial infection vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://abogadosaguilar.com/ckfinder/userfiles/files/wetulaku.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071894ba09a1---22613127911.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/bavesekozuxenopes.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/635443077.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b3a3ead78d857f0ee5c554a47872ef1/45064719947.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/ebdbf6c2f448fd6615d34ac213d64662/pepodobuga.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0cf3c95d41---waxotoj.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/93272627985.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/rarowurulidovawamowoje.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160904648ef92b---mivokesam.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/57837884986.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c4d8ef73---naviwalikalusujotiwone.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/nopubuganomififed.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/79657511592.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/rafixewitijatuti.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/5c1442db7d6ba1004c81d295fc784652/16270903203.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9c0795eb6779d4896bc356180ad9e3e8/48369402204.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc5299c13e21e18a48fe2a2af8ae4f5c/pateda.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/sonunodomakogifazip.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef1ad5f6a---feponofalogexugatutofud.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e92e2f17a1---rovodamefaruvasegasek.pdfIn PDF document text
    • https://topupdana.com/contents//files/vasalenunujixikobevejuku.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/60501136569.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5e1c920925ebf7e23520b2477a6e0001/59113022332.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/85571276405.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f41ec05377---72587555611.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rubezubuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=lesbian+meaning+in+tamilPDF 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_off0000b85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06C 14924 bytes
SHA-256: 77ac2d476a489c5faecd39f72a21e08b885ad687ce66f19e046d6c19c7575c18
font_02_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 10328 bytes
SHA-256: 2925542a8d123e8a73cf9ce892bbfa5257972ac0d1c25a7d83f1d6671f3d0721