Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe5fdb0d23bf586…

MALICIOUS

PDF

84.7 KB Created: 2021-07-03 11:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55cccc54bcb47957d9c60ad56eb6e355 SHA-1: 9100ee98e4d1ff99c8e915cc98359f5a9362b13e SHA-256: abe5fdb0d23bf5862dcd214c8cc95e1e68658c7a408129dbad0671fccee991b4
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack where a password is provided to decrypt a subsequent payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.toptehnik.si/images/sasefeketevefigopitezufo.pdf In PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/8r1hjln7q7225quikmluplf85k/gamowoboxap.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a1f5f316d---fovoxinanewenekevasusipi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160acd9b9572a3---tapusadixadikunetudumug.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/dubibokafosazolo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079275ba194b---32224241578.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/zoxesarogikejovumejadoj.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/74905281652.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ebd435ab1---32899259394.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/pomubigolugovomipokereg.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/9425916305.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/00fbf575a1756b447ff14e0faf8195a5/jogokijikenixoxewivuku.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ssc2h2fl5v3kld8fgihvbjdpm0/koxivajapoposewexi.pdfIn PDF document text
    • http://asustainable.com/global/file/fakefekajufikufoxuvilo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1kia6fbjit3bcla94lpo7s9d4u/67366476538.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/lumazapiv.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/24568794784.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccad9f08f6---jefirite.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/lokanobumadupozipavok.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/sabupi.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/20589251201.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/r4m6m41qd1555ghkaqdttls6m4/xanoxamegonugonafa.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee02068245---sudinevaxamepedezemov.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=conditional+probability+diagramPDF 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_off0000e56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56B 10720 bytes
SHA-256: 48413574e736250914e3df9f190073b6879c521d1882242c7214a297db7f5bf0
font_01_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001159c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159C 18100 bytes
SHA-256: cb290d12613dc95f0291d22e09716fba267cb6ecb65a92a568a7c635332d2887

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