Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbf1e341d682459…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 19:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56a81a01cb91bf6298809d5932c6a989 SHA-1: 639c459acc15f3f45a07f864543f81f2dc504cf2 SHA-256: 0bbf1e341d682459259bc20e2853e32e2e19d47be58b61377bb5157c641084a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the PDF is part of a link farm pointing to compromised CMS uploads, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/44d3f846ca95bf595152f342643b9290/jaguzogajarizonimufudo.pdf In PDF document text
    • http://shengnabei.com/uploadfile/file///2021090223202438.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/vukuviduke.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/kql4nr7trbdpqmhr14k8icllp6/bibinazasojigaku.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/91842914883.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/wojeb.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/nidomifasatom.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6a4cd70613201f05ff911edb3f57df13/ridowopakuwuguwaluzin.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///zofiganizi.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/josobip.pdfIn PDF document text
    • http://millecolori.it/images/file/18393212484.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/gadikoj.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/89277425291.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/2098482721.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc970a4d2---kuxiwoxofosizun.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/jaxefakeselezavafemabut.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/xiwabaxogajumimox.pdfIn PDF document text
    • https://istanajp.com/contents/files/mitatexasezesefu.pdfIn PDF document text
    • http://stefani.cz/fck/file/medoj.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/pojawusozalaviga.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/pizejunasobifoga.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/medaf.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/bpvrc4ol7hu5ct0hl2ce8im20u/8897040394.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ji8vatjo8dgq4qmmepv60fbn64/78548361020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+cite+an+image+apa+7PDF 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_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 19444 bytes
SHA-256: 966cc43d9768b5818421577e64932d5cce09a68e8cc4c2dc463e679d0ce072c8
font_01_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 10528 bytes
SHA-256: 1710223a00c8b8740a51978775fee71700f3d1899bc181e0e22ec56928304ce2
font_02_sfnt_off00012b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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