Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8586e2485aadca…

MALICIOUS

PDF

86.8 KB Created: 2021-09-10 17:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5eef7c7ccdd719b73bc78ba6382ad986 SHA-1: 4ba76f7fe0b7f94c9b41a8a004fa040f697a0259 SHA-256: bf8586e2485aadca19cf715b5ffeb62bfd1b3d50fa6a40dc9f4d87ededd1d4b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://burbank.kopanramen.com/uploads/files/79192596321.pdf In PDF document text
    • https://biharlokmanch.org/userfiles/file/86714405110.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/gidimiwegemipinogotubaj.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/jovos.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/vazunabo.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/tusolawozowosezajivulawa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6c1cb7c6---rizudibixuxo.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/58735309832.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/33240502739.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/fezabiwotad.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/44424675365.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/dowirogegonos.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/53348016809.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/86224797446.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/didavo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2a90727692824eeecc281c06589915cc/60285688148.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/27508714963.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/muxetosebipopopawexafi.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/79631027402.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/90189373282.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gc5jakl1231j2ubhu3s8f08ph1/mobij.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/lejaxikowegubuvudat.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109032328302730.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16138551143cf9---nonovuxodu.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/rufubarupak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=shrek+en+espa%C3%B1ol+latinoPDF 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_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 10724 bytes
SHA-256: b2867366d3b2aa691356076dff697374fc041954551408499656ead836e019f6
font_02_sfnt_off00011acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACF 18984 bytes
SHA-256: 43806572f6d17e1e0e11ec583d7bfbd6934743366bbc8ff91f033f1a93d8026f