Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0f463817417ce6…

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 14:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c1c7d471be9cf2d4b796d5c51fde8a9 SHA-1: 43430ddd6ee13914653d9480db9cd5055ea843f1 SHA-256: 3c0f463817417ce6af36e6a1e4f1445fbc55ee1affb675abc3090921f892c63b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. It contains numerous embedded URLs, many pointing to domains that appear to be compromised or used for hosting malicious files, suggesting a phishing or malware distribution scheme. The presence of link farm heuristics further supports this, indicating the PDF's primary purpose is to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://stalmont.eu/userfiles/file/jimugewobefo.pdf In PDF document text
    • https://smilaxlabs.com/userfiles/files/jixipoxelunevi.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/la5s7jit9ghm4c1ffqforl7ems/nafek.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/20590681246.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/tenukidoganivosugi.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/meteluwoxutoti.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/moxijufafavugifa.pdfIn PDF document text
    • http://apart1day.ru/file/jufuvavunumos.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xarikivuki.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/46493303712.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/57473086674.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210820_3AEEB331A268899D.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7bfeacfb5---rozuvezoxitu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2ae92402b---82286898845.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/31748125109.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b8f74f05f---94501554945.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/41112814495.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/bewatijerevexulor.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609847374df45---forizirufikakokof.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/4166c909ae2fd7776488ca56a569c7e2/tiwidifikikojakodoxiwam.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/22141768160.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/d0sqgg5ujn493h4ortacst1ed5/gutixuvuviveke.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210714_C8E245481A7FC67C.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/34598361177.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104322326c91---54444129217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=kooky+comics+tracing+sheets+pdfPDF 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_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 16824 bytes
SHA-256: 8daf61d5d9ba348f3f4b0072912553fcc1a76c19a9403402f97cfc053e183f8d
font_02_sfnt_off0001329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329C 11220 bytes
SHA-256: 24d5da97a5ff6f9ec0a21fb4b079ae1f9919a79d79581f0edededdab47674f98

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