Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b27cc0169a8eef…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 01:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dec7ecda6531ccac55ffe067e88cb893 SHA-1: 6aa7a7821b5e0abeec3b9f7e385344085a81ab2e SHA-256: b7b27cc0169a8eef762e316e7017add51fd0b00f596db9ce949509bf8ce17184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cructi.ru/uplcv?utm_term=delta+nintendo+ds+android PDF link annotation
    • http://pxmonastery.org/CKEdit/upload/files/debizoloroxowosefajo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135570d4286e---89918495567.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/xusuzomerowa.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/xokelakigotirufosamakineg.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/kiloxabomatomolu.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/10030735999.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/75285676120.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613059d006ce1---sezataluzorevaf.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/ledanikiravobudakujib.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/lareligazulosukakaraj.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/bopeleliwir.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/4207291831.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/79002116746.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/060aba06f5e8de3b972a1a598b45a9f9/59797040674.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/68979007024.pdfIn PDF document text
    • http://prosquash.by/data/75141667412.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/keboriwigabi.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/wajubewelolim.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/pobiropozadenilaw.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/32896756750.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/javewidovedogexadodabide.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/togudabexuzu.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/woxafogibujaz.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/14235524293.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/39242289684.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/konogawiriridabuvuwedexu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8845eea67---54227269332.pdfIn PDF document text
    • 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_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 10240 bytes
SHA-256: d971617f6330e4f0d5dac9eb435ddc420ea3dfc4601e0112decbb6a8066f7286
font_01_sfnt_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 18792 bytes
SHA-256: e53916dfd2d1895cdbd438dd5382b7abc0a7fb0fbe8b183523e35bbfb267f2cf
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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