Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ddc5bfec67e69d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 00:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7aade24c86c89de85c542e810cfec587 SHA-1: cc2e5088c526278a8763b115d3d3a1915ddaa510 SHA-256: 59ddc5bfec67e69d6f10cf9799c0411894abc3dec15bdc7fc13ca7b4bd886bbc
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of multiple external links indicate an attempt to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=how+to+combine+pdf+files+apple PDF link annotation
    • https://pediatricpotentialsnj.com/PP/PPpng/files/22325127990.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/buwanexufi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f025a217d3---xofujor.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/54698219870.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7c2b4fe3bee2d3e7d48a92f90a23ddcb/detajora.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106241638.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/34616566403.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/49826030206.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/34625be3f47266130426c1a55b24c94e/pabokifexogibimonoj.pdfIn PDF document text
    • https://tekartltd.com/upload/files/98959060474.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/060954536590.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610dce8eed396---38069689705.pdfIn PDF document text
    • https://digireg.es/upload/gerakivebitemodawokeme.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/bawizop.pdfIn PDF document text
    • http://gibisch.org/files/files/40539757098.pdfIn PDF document text
    • https://siroyensao.com/upload/files/40582138476.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082651ee1b5d---sapepivazodorima.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/dufedufiregepedejeme.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/bvs9v1sem44a6mmq4g9q3e5okb/niririwu.pdfIn PDF document text
    • http://mayjack.com/upload/files/74595709095.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/baxamipejelufavezupijigop.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dc7ab79565c93afbed35b567cd11554c/63064490309.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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 10900 bytes
SHA-256: 268e39d76fe77f9310c2ca8f3f8d85790e1f70d01dcd55f34fa00ef887c46440
font_02_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 16968 bytes
SHA-256: 1a199adeca071f8e6207ec273975bd51a3bf417f20acf5e99a2efa87b0a395eb

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