Malicious PDF — malware analysis report

Static analysis result for SHA-256 8726b5f3e3bf05f0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 20:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39ad360871e6cee6714879a22d3c682d SHA-1: 9bdd6247a66f5ae9b9a4a930b98cc2f18da7285d SHA-256: 8726b5f3e3bf05f0df16b9ce1ea4d6aa2347afaedd0ef6798b5ee7ca31b914c6
204 Risk Score

Malware Insights

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

This PDF document exhibits malicious behavior, flagged by ML classifiers and ClamAV. It contains embedded JavaScript and multiple links to potentially compromised or disposable hosting sites, suggesting it's designed to deliver a secondary payload or redirect the user to a malicious site. The 'Remote-support tool lure' heuristic indicates the document's content likely instructs the user to install or connect to such tools, a common tactic for social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/78571741413.pdf In PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/vapiwe.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/supazara.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/lozixun.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/sofofuzukigotoxodotub.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d182fde1ec---61436838258.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/mejibuwudolesawe.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbd4c6249---40650195406.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/wefewebipubevilanonixa.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/rixamiji.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109150915302699.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/nozevojanozo.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/27699743079.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/siwupukavilojolojijiba.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/66245461094.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/sup045gobtsjidkjlq9t4eud42/pexunu.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/xozagumunujojutisumetub.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631010825razurunevi.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/mefafovakavezesizeviwef.pdfIn PDF document text
    • http://jawarakreasi.com/file/26048941734.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/48696845510.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/malunazitaremag.pdfIn PDF document text
    • http://profstil.az/userfiles/file/videbosone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=3+person+dominoesPDF 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_off0000d352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 10324 bytes
SHA-256: dd09076883c91a440ca93a9e718130a57da65c60e6d98a31dffb9758ffcb7e3c
font_02_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 17336 bytes
SHA-256: 2fc7e9fddbe115802771bef86aae3e1a14d611e77af314451272815c9c6a2530

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