Malicious PDF — malware analysis report

Static analysis result for SHA-256 149b0994b0a1431d…

MALICIOUS

PDF

68.1 KB Created: 2021-09-16 04:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f3a7728ced808fc4792ce10292f1cbc SHA-1: 9a89c68892364d27170020f2875cb5c3a63f8a81 SHA-256: 149b0994b0a1431daaf7dbd703a7def60a3c16b52cc8d41ebdcb40139f7fc8e7
162 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content or further download stages, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6614

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.
  • 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
  • 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://queure.ru/uplcv?utm_term=android+web+browser PDF link annotation
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/kasub.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/29397236274.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/45567454082.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/45225827083.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/67753933407.pdfIn PDF document text
    • https://carlojans.com/cms/file/8579286452.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/36559141601.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/79908331883.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/wikivixigosipenenaxoraguj.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/molataxumolodegewaroxo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fbc42f6d7526486c65970e22ac34547b/55330124652.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/vunewebinege.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/pebiputodi.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/piwogopimasudid.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/71057031369.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/luwozamisodegavode.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/20762059960.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/12b3684c3e37ecf414ddded35700891c/pafovukipetelumivifer.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161339940f2442---98898194807.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/logetitabogugik.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/totaje.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/608bdc3836c0f2219f4041484c0a386e/96652612724.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/veguvizodu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/lirazidejurusalijezi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 18060 bytes
SHA-256: 1c291554fbedb0af185cba29903a795c1ddec16219faa54b545b8379a8b86630

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