Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08f0fc89588262f…

MALICIOUS

PDF

75.4 KB Created: 2021-09-15 16:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 559b4203c61345208905dce94ed9e852 SHA-1: dec05913b1761e79dfaa00985d09551b1469590e SHA-256: a08f0fc89588262f8116e53bd7b362173f78f33f261011d51d7b008c359013ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external PDF files, indicating a link farm designed to redirect users. Heuristics suggest these links are hosted on compromised CMS uploads and disposable hosting, increasing the likelihood of malicious intent. The ML classifier and ClamAV detection strongly support a malicious verdict, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=little+commander+2+apk PDF link annotation
    • http://wintec-samu.hu/uploads/files/fasujisesi.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/79857526202.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131940053cdf---fefewemabuwuvumafofuragi.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/zozedu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d44bde5b---14335517332.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/vojirizonogonos.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/47849803524.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/jimopiwelomipalafudufobi.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/67686264954.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/75635385830.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/ponulamerej.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/67446095093.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/5154945596.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/libik.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/wekilejipuken.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9096316cbae4fa8108aba38aa65a8d7/fonebezuguvutopafeva.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/dozarazasadezoxeke.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/xikitubadin.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/tunupitasevujekesasoti.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8jm4v6k2oe9ectsa7fcq9i87v0/89202022633.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/96709739201.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/lepizeninufejisado.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/gobusakisegazige.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1d51978b4ef80362fc8f0904d1d3ec1a/lijuwonuxovizamufopuw.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_off0000c2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D3 17348 bytes
SHA-256: a14190285992e7ca3e70473ff83004664d2009f0a92e3a70937ce25783d3ce30
font_01_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 10676 bytes
SHA-256: 93b018dcbb17699838c1b28097b442ef9274d88d8f268e35612c9691b42472db
font_02_sfnt_off00010850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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