Malicious PDF — malware analysis report

Static analysis result for SHA-256 09647a1c471b6a61…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 16:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b5a0787cf35f4e035fc76602ae11062 SHA-1: 589dbb33254c84db96f3cf716d31332ed65509ad SHA-256: 09647a1c471b6a6145642a1e16434808febeb754155d40ab1ac8378cca0e7e3e
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links to PDF files hosted on various domains, including compromised CMS uploads and disposable hosting, suggests a link farm designed to distribute malicious content or phish users. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://anoh.net/pds/userfiles/files/belatedaw.pdf In PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dawapomovexejatasapomof.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pn1t4pnnlnmkpvc5idk8mfcmk5/jijogoxifib.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/jagexizaf.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xijisisepafegegupak.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/vejoxutegegojalofifumoma.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/23390718726.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613041266e79a---49977284954.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/31320505033.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/xakibu.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/wanodurifavubaxefatofek.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/59055900248.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613747b390bc0---vobaxotubomekazamerere.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/12076435767.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/74501780547.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/tekitabu.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/sidefipezanuj.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/11473514808.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/87093024059.pdfIn PDF document text
    • http://rcot.by/pics/files/34630140.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/80623343799.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d362b24942---60859721368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+install+windows+using+android+phonePDF 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_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 10848 bytes
SHA-256: e77d2d17a24c1fe136e0226ebc9761e5e95b6824901bc18ddd0dccbedebf58da
font_01_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 18068 bytes
SHA-256: 394b1403c285af09a0c7d4d690e26b89d7972b87a3abaae623be17aa5a6759fa