Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5d2d1207b4b51c…

MALICIOUS

PDF

91.8 KB Created: 2021-07-20 22:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ecde360778f0becfafb9d816c63db9a SHA-1: 2c39cd89612a631d548fef030dff84c92691cdbd SHA-256: 9a5d2d1207b4b51c7ea1dbffcde7ba3f955cc7313c0291697a061a41fac78895
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/d9329efb33142aaaa812408c2a06442e/dabimoju.pdf In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501234806850375.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/5626773966.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/22865496985.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/zadogeki.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/supuke.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/silowemubaxageser.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078b395801d8---90909183103.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/kigubodugumifonibutew.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dnnsrtnhbs2crj6p3jr3thd6d2/71065209572.pdfIn PDF document text
    • http://cycling-software.com/files/file/xowomoxalegidogosopizekav.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cda2ee2150---12363963119.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/71590549450.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e314416137---sanelasofotef.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/xarifumumumeso.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/dulafitizomademalitasom.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ftulndt1009hecn9keiglh47i2/54843427450.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf65db08563---94672389757.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/42d8bc162518820e20cb732aec14821a/12995722263.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3db4d4c835bf2e9973fc97ba87f1cdd5/virerorinegigaz.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608102bcb7da4---69653408953.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9826dc12ab07867f7d7e0ff8a46dce3c/36107148528.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ca122ec7---lunefixetodafi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ac7a46f38---memakilenetezulorexuvekiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=introduction+to+biomedical+engineering+solutions+manual+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_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 11156 bytes
SHA-256: 2c71c3c25bc708e3ab594d1a6c9162e1e8d7f9cb0af32b442bab95a00cf2e616
font_01_sfnt_off00011cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 17140 bytes
SHA-256: 027f6713c68b3e92e873391c21afe4ff65bf6b09ceba169301a3158e24c4a85e
font_02_sfnt_off0001498d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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