Malicious PDF — malware analysis report

Static analysis result for SHA-256 d088d77c58c5e6dd…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 05:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8919d93afee8b51e5e0fc0ffab79ff54 SHA-1: 01899235b0cc4eb36395bbf66525a2f7a42eb780 SHA-256: d088d77c58c5e6dd72cff0b22ebe030ff85d2b03efe7cb15650372cb10dbf583
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that point to various websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The presence of embedded JavaScript further suggests potential for malicious activity, such as exploiting vulnerabilities or redirecting users. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8ff4fe15---zopalavufasexo.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e04875a9b64---12068064023.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/101248202230.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/laxivetenowok.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a64dd29d30e---97467073705.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/35920045426.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a8e3de15bb244bc4b9b9573e7ae9692a/77462419927.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7747e74625f8f66c5ce2baf10a947490/simoxovivizisepope.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210621162424754893.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebcc8e046d---sofawik.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/70008966950.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/zajibutukiwepepilurif.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a216fb59571---16697528503.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e83b12527---38789535246.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/nebivubamemabipew.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/zitoradokowarux.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/mejelitexulekawelosufu.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d790497fc8c---wuxafoxosasetojufaganerad.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/45514457607.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/waseja.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdebd0e917---lujukum.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a69c589e6a1---97804912537.pdfIn PDF document text
    • http://recrute.fr/files/files/66382985836.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/midujuzaseniburirolelubav.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f9be2751---sefisor.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/13863156594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+convert+to+word+file+softwarePDF 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_off0000cce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 10620 bytes
SHA-256: 2d05a796a4f3076eaa396e0c2982b95362eaf920166932451335d736b31a5415
font_02_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 18236 bytes
SHA-256: bf3100d00efcb2f24770639c66cbc6bc1d79d36ff9266f3f9d67d16779fb416e