Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b113ccc599c4071…

MALICIOUS

PDF

83.9 KB Created: 2021-07-01 20:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7e96542329c29832545807ebd737831 SHA-1: e77e30e9405d2b21e2ed2ab9366bbb7883c14719 SHA-256: 9b113ccc599c407155363c59bbbf2972f4428b62c709c43e62903e8feb0530c2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://bpsstudio.hu/uploads/10464247645.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9ced44ef---6946636744.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0a0d9da8---guxegigotowagiwoti.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/42fe8dfc550997eb39e1df812b51112c/55981449703.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c090a0c0999---tirapata.pdf
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/jezotidubemunuwir.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/6a86f58e7bf06d4ab5ba07753f85e135/24969436824.pdf
    • http://ccswcd.com/userfiles/file/zanugavufimulixuz.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2afcb139674adb40622394e1e0b6a26f/vobufotizufutem.pdf
    • https://supermagnum-bg.com/ckfinder/userfiles/files/tidemuzolitejutade.pdf
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/34949697212.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/cb38bab45e5dc9115b2871ff4d5581c2/deluforunowasovu.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2a2b2daa9ec85c7bec9098827ab8b05a/49422953345.pdf
    • http://markasib.ru/ckfinder/userfiles/files/96956419367.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a063c06f177---10309725224.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/00a1e450ddfde99a3afbca84432fa75c/vebisujufig.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9ca75a02---33957311691.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/33391638430.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e3ff1d8ba0156a12bfb3ae7d2595347c/sufonobanebobusojo.pdf
    • https://sinhadventure.com/uploads/file/71828385122.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0lib9pgh3cijvvs5mo1mofnfbd/30113615756.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/4518b6be77265bd727242893f73e9e3c/40667533648.pdf
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/fodapirobuwebugotajefop.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=teachers+day+card+making+for+kids
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 16792 bytes
font_01_sfnt_off0000fbde.bin
f5ab2962e169fda58408d041c6751ceb79e0397055d7f61d2391394ebd301b3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 10948 bytes
font_02_sfnt_off000114e7.bin
6243e642dcd44215f66b55fb6a20a288d7e75d36cd6bf7224c498c4b95de769e
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 17680 bytes