Malicious PDF — malware analysis report

Static analysis result for SHA-256 9115a470d31bafe0…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 09:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 206b46551f47184c60e5d200ad95167d SHA-1: e8cacf1a9308d9545188a92362dc326fb0c09515 SHA-256: 9115a470d31bafe0245589ae2b79acd58d149534158d40238eff975f2f93f029
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or IP addresses, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest the document is designed to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=pycharm+ipynb+to+pdf PDF link annotation
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fb8335cbd---nekonifowixabeso.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608677ae04016---vatil.pdfPDF link annotation
    • http://oralrem.kz/ckfinder/userfiles/files/gigelofazuvowusuv.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/40074598544.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/030647008520.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7db4bbc0352e6bea3b7b6fb36194e7cd/xusowudodajifamupa.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/lvsb4egp6dpo7qtu35cgt5ea7a/musuxegavikefim.pdfIn PDF document text
    • http://www.centralperdana.com/file/jodevikirizaniji.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/24753726050.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/geborutadikamoxasosenenev.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/nuxutadiv.pdfIn PDF document text
    • http://momsystem.ru/public/file/38238320529.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/mamot.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xedobolosimox.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b318e3d1fa---4839987055.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/sinevupa.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/tewinusaf.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/88c2b1a4c1e880d58cc7f23f787b768f/puwifiworutazu.pdfIn PDF document text
    • http://semot.com/Store/userfiles/file/53983264840.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9b95d0b4cc3559deaf4434e500f20901/nutuganiz.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/8981851252.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161082252eadd3---20208577437.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/02f6a0266bf5f50d24b14d95cc443e4d/69556852226.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_off0000c34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34D 20536 bytes
SHA-256: 37e9158921f4f4eb2fd94d6b73b36f44d24f89f8274051d6b083330bfc803113
font_01_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 10792 bytes
SHA-256: 70a10643a0bccc4676a23e40fc8140c9d23e12e5f3f92a5e41d55f13dc37567a
font_02_sfnt_off00011245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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