Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6a0cb9dc6cde7a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-19 06:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28eda3d145f9825456a73cc00ba642f3 SHA-1: 6edb722fc8c7060a4be204767ddcd50bc6285e14 SHA-256: ba6a0cb9dc6cde7aee15d7284beb8b38b884654fb988fa584b8392729504b557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://salvamontbihor.ro/app/webroot/files/userfiles/files/netebopidazinerutenobif.pdf In PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/rakiduwa.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/51429816706.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/89772286388.pdfIn PDF document text
    • http://apart1day.ru/file/lifelunikinemexevorafanek.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142287af3faa---83393970613.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/32110997329.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/kulapanozegogago.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/45409369739.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/2374685397.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/zevenexobitareketif.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/sejabib.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3dg3hn4jlt1f8keng0su8ugds6/rosiwuwaketelidagosik.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/75310418920.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/fidig.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/19347453238.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/fiwitulusarowojina.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/luzipipo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u700livk1fdsnmfol0p5as1mm0/68846497143.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/27194181776.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/zimewakuxirukarekegu.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/safikiwizi.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/22442234151.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc0ca9382---69016665993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=watch+boruto+naruto+next+generations+free+onlinePDF 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_off0000ba43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA43 10948 bytes
SHA-256: e0483ae97b0cbdc1c2defdd2fe5b6331c26db0f9474465a75e08a38ade059871
font_01_sfnt_off0000d3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A5 18424 bytes
SHA-256: 919c89a5af1dc7d8db9d740841b3ffa2d21754f626f89476e0205d17679fabba
font_02_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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