Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbfb6df54aa6654…

MALICIOUS

PDF

78.7 KB Created: 2021-09-08 07:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d510801652317b2ee5ad96a582024305 SHA-1: 5c5cf995e802983ada508151663993e408d7fa42 SHA-256: ddbfb6df54aa66549c53ad24a4b30ef03ddd7734526a3810b318e8a7db04aeef
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/0ff1ab51fbcffeacd5f1485c727511ec/bolumopos.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8aa488a1---46837347941.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/2656080891.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/tojarasanejipulusowizo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607793f79a6b9---42406346411.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/37937169157.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/79092428424dba9bd70cf4050fbf757d/24470554137.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c4f303705c9223665e00823fb928fbb9/rokudenumusenafibiwasizi.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/98581032000.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/kibetofutixod.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f72e0264f---61187298193.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/sifiso.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9ac5ba60---61224391692.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/60432977381.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/puxafodiputojuxuzakok.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/xevufalixuzezugaraw.pdfIn PDF document text
    • http://giustofiori.it/file/vokajogosu.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/lurekawipumeroso.pdfIn PDF document text
    • https://afayl.com/userfiles/file/25682608171.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5237c1e7---pupanefefafibusinu.pdfIn PDF document text
    • https://seikico.net/img-tym/files/51453306926.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161185c341f977---wawobewavuvevimoz.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/zibezupaf.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608af25ff25b7---woguzemozo.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/kijulolax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ver+archivos+pdf+online+androidPDF 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_off0000cc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 10652 bytes
SHA-256: e2e08093f8c3cb284bab8464af49127c1000cb0703e5be375e56cd63f598b4f3
font_01_sfnt_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 18652 bytes
SHA-256: c96a413015122306640402b91256f62066574a0c929c45046126997ff472464e

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