Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94539bf7d6f748e…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 04:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5329d52767b35274a1c9e85922c62308 SHA-1: d8e5a28d990a410ea8eeb1476bdb5ac2c39446db SHA-256: e94539bf7d6f748ea30500d9562dd8b0ed35db5fe239957bcba2a93f9377d449
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The presence of multiple links to potentially compromised CMS upload storage suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://0800-707-808.com/upload/ckfinder_temp/files/20210810125430.pdf In PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/11444214337.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vosaporedodisepokabewup.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/xutufivatusekakafejojaga.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/amdr9h68uj7qnjr5jg4im2k3q3/71009136401.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755f4e315c9---ravediwuwegibagiwej.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/5765356547.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51a854d13b---dadedenigijawijip.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c59c94431---94992574193.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51060771127.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/56671d012957ca3a97878a6afd96bd14/19156784037.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee753be72a3---januwamamedijaxumunepifem.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2a962e2d81cf5ee097c83282a2413128/rukudidukaxuzafixadof.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17890e5546---dojatonuxomawevejiwoxe.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/18891893038.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/fdce7f9b07415ac758448bcd68ad7739/munavotatapujerato.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/63345487297.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/kakevozuxegurimufobiki.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/e4g7judshuacs2pacl646es3p1/33707157455.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/e02bsr6ct9j92a5g01mjvh44d5/vovape.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/valovaxizebimilivobiga.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b39d460360f334fd9e69c31376407a4b/nopowosewevuxasamutepiro.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/modobedokotor.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/49658681836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=herpes+simplex+keratitis+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/megimilo.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_off0000c43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43B 15992 bytes
SHA-256: 1f414130e41ab84c2645807ce8c6d437ff2de3357a0ee75c37855bcc6277cde8
font_01_sfnt_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 10620 bytes
SHA-256: baff77ca56e3ba1a3800ba5be3c238e5b001cea6cda2d77c3b55c691a76439f8
font_02_sfnt_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1