Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82489c6c391d9fe…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 09:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c76abb878a50e7b5037d5a1f7e708cd SHA-1: 7dd247ba8d001175fe39f4de5e47cc73f1c8be05 SHA-256: c82489c6c391d9fe1629ba0c57a0a2599d3647b62307f8fa34182ae8e9d2a60b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://luckysurface.itweald.com/uploads/files/612fb8c78a260.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400d2dd6447---nibisaxetafu.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/12238061417.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/90452635016.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/18732685839.pdfIn PDF document text
    • http://servmed.net/userfiles/file/boxedinajevewowopo.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/mudedisuxotosubenabejapi.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/75510687188.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/df2893ad3d29e3cb55c864aa870d8bd7/vujajixerafivujewibut.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07a0a0afb---nufitutoxe.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/risogulivirakuxatilikefo.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/rufomeludefukifitavelovo.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/4844315699.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/55921325663.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/zudewuwobolizajarij.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/xokaweduna.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/90802531897.pdfIn PDF document text
    • https://scalping.ir/data/files/file/64219017252.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/nuwefijaxuvixixofi.pdfIn PDF document text
    • http://idroter.org/userfiles/files/33194484507.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/ginukaguxovujikulifepe.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/wotud.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/pukumujogibudawusilizafe.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/8340635009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ppsspp+bus+simulator+gamesPDF 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_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 19952 bytes
SHA-256: 125ab8038b00d9cf7002fc78b8b3ab50befc79d65b9b722034178543153a1438
font_02_sfnt_off00012e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1C 10732 bytes
SHA-256: a8dc03af034be1e00b224b71ae5845967ac64feae6976c1daca98a66d086d342

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