Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f7b5be7ee7e380…

MALICIOUS

PDF

71.5 KB Created: 2021-09-01 05:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc6bf092f4c47ee270a364f46b29ed66 SHA-1: d04607d259112f9dcf6329bbfb963a2769d9da10 SHA-256: 14f7b5be7ee7e3808e5c665853f00200a0565a559783406a2de42934f82ee2e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF acts as a link farm, directing users to various websites, some hosted on compromised WordPress installations. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://www.c-l-r-p.com/admin/ckfinder/userfiles/files/85794085411.pdf In PDF document text
    • http://desushibar.com/userfiles/file/gexizugas.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d20c7350858fab0ff111e5ec9167ac55/84042953258.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/64695163034.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/99447495373.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692930408a---74797896729.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/89165037088.pdfIn PDF document text
    • http://congtyvima.com/images/Download/darisef.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/gowibeputegumu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb75f7b320d---gixutaleledumileko.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/vuneruvupibonax.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/91d6d0fbf916cf3137e6deb6fc525899/gukavoxojigenetaxitinib.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/s32f2c3kvipca93sbd6qmaomrk/momoriwekodogiwutevup.pdfIn PDF document text
    • https://ewt.cz/res/file/bepamixaleziravo.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/olmmdkbcp4ibglgp26tc41jj33/xebilugu.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/32539868159.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/dibafukutofib.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/xupezasa.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/nisujekofakizaz.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/97165116084.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/16057908119.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160825682f32f2---kusutox.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/86816932705.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82734587f---62833423014.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/99687937632.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/lh8s0t7h86s4ab858otmsb0ips/bojume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=speed+maths+for+cat+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_off0000b90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90D 15116 bytes
SHA-256: c0f00681c9fbfbcbc710cce4c0c55071518f158a7f86b175ac236f82bcec9aa0
font_01_sfnt_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 10716 bytes
SHA-256: 0819c16a34cd556b4e07f16509f8cc85eab409af1d76e8ebf981f70682e1e2a1