Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7e6b12a7a46d13…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 05:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd5d27476c84944503c9d7371fdae07b SHA-1: b7eb93ec9bc327103f72293c512aaab597c14e8d SHA-256: ca7e6b12a7a46d13747d57f7bd06f81f8d03103bf8d1c87f9555028cccac34ca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=olympus+om2+service+manual PDF link annotation
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/84332704726.pdfIn PDF document text
    • http://cke.hk/userfiles/69626837230.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/5edu13274ejg2vrrol7a6ivpki/64537047587.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/88350390293.pdfIn PDF document text
    • http://bienbao.net/uploads/files/25328443923.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/158eb7057366371363cd494205fa11b8/85879024117.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/75109663b0134f1f31df5c205829f792/56925190172.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/navofiz.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/770529d0c313cdfdd17669dfe348c339/juzifipawemibuf.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3bd190294695159f7e769617358436b4/23067588989.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/kununatedosowo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/cbetvfgrar551fdm5i91kq5jj4/35928405486.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7704fd0243---pisibadakipuzusovi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9668dc376---zemotarew.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/lebenokijekalivetelir.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/fekasojufigixo.pdfIn PDF document text
    • https://jagominum.com/contents//files/41390268239.pdfIn PDF document text
    • https://digireg.cz/upload/rewotabemefubuluwisunewo.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/36836422267f97453e712e5d8091f86a/foloj.pdfIn PDF document text
    • http://hadt.vn/upload/files/jixeboweradob.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d29489903c---19952909141.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/42257823592.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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 17484 bytes
SHA-256: 5346da514b7d4d547e3f1eff328b575c9fc64616f7439c1930885a0cb36e9822
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 10864 bytes
SHA-256: e70e7275abf4e746504f76be671e61ff7da81f8378705f34bc9ccb0cfc618ca3

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