Malicious PDF — malware analysis report

Static analysis result for SHA-256 8363c3a1cc762419…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 13:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6412359027781cb814cca833db201c5f SHA-1: 7c42adf8df2e8e2906556f694eb4e3e73c55a3c0 SHA-256: 8363c3a1cc7624197c63e4f62446a51829b57d1f530b2203d47fad7481060069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to funnel users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=postconventional+morality+definition PDF link annotation
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/vakedenewipumepoboxulefo.pdfIn PDF document text
    • http://boxethai38.com/upload/file/watemafo.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/delazewi.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/78863453866.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/49130516285.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/9667143666.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/dakaduradeju.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/kedebalipifabib.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4eca0f74a1d412159d746b18b332a677/53275946196.pdfIn PDF document text
    • https://naves.cz/res/file/jolaxanepufedomatalav.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/xuroguf.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/54011753432.pdfIn PDF document text
    • http://maconlux.lu/userfiles/files/mesijudipogobi.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/75235950600.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/31739539868.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d683a7ee79---kopugerujeretalexigatagu.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/juneku.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/45665796921.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wibezaretenemi.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/wovipe.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/31417439516.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614412933c007---nujobegovumijovuzivagupej.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_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 16428 bytes
SHA-256: 5ca5987a6fd0c515ed6b95a5e867e7fc07608bc6bb9261ce4c46a366c8ce6120
font_02_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 10820 bytes
SHA-256: 3e3a30b8b563af310520e66e21f29a4abbf7b8d2d3350dbd49636b7cfcbdd74d