Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc5da3f9e7f2c65…

MALICIOUS

PDF

87.8 KB Created: 2021-09-03 04:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bcee2e2f913afc8e0795048b1f84139 SHA-1: a14f5e435cea5abc01d4647814179aeb1dea9b09 SHA-256: efc5da3f9e7f2c656097d11fd4ca5248558cabf67b70d20846cc924f95090314
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=problems+in+conducting+research+pdf PDF link annotation
    • http://ballstonfamilymedicine.com/clients/861402/File/79297908140.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/12021134486.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e2089f21---40508774483.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/silerifenafog.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/nugedemitokixuzorawinela.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/sogexuvolenupesipizal.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/78517361129.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/nf5jv00m3vbrsahovken4b66b0/lejigilirabovixoxipuraji.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59884e324f---9398057749.pdfIn PDF document text
    • https://krossi.ru/images/content/files/rabedonagiw.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/9660026620.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/xafasowikovulofufu.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/nasefifogiweda.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b49f4b4325---38284256288.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/41507100165.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744d1049080---guwaxazolexopovobi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086cc94ef6a6---80829303470.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/u8247ldadepr3c65l5r321klj0/19341757199.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210625031613_5evwr3.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082adea6f1db---navedolipinukoza.pdfIn PDF document text
    • http://hexindechem.com/upload/files/rikawiwejozibuvifadarudav.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/vepudowizirinawubax.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975635c74c7---41850498363.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210812_B1F58188967399F0.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/11159878339.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_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 17628 bytes
SHA-256: 7c92da079f56979f28102bde26e585236f995bb17a56722e50093f70564f39e0
font_01_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13705 11308 bytes
SHA-256: 5197379c3c8919d5afbe4d194fa83ce1c0a2f66ac1c762a616af327585937057

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