Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d97c0a6d5dc91e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 02:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 667987096e5166beb7ee0dbf2e62bd60 SHA-1: 2271b1f6f8fcc664c01efb5d47b5f4f9b6b4620b SHA-256: 38d97c0a6d5dc91e65e15c080ba38083484fda8afcab5453a4e952c2663398cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://nomylo.ru/uplcv?utm_term=jobs+in+bangalore+for+manual+testing+healthcare+domain PDF link annotation
    • https://digitaldaya.com/imagenes/file/vupugipowixa.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/8139651c53a0ac095a17238288859648/luladafewekaxisuzi.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/riturededonufowisu.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/19870056605.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a3f16e2b8---11252597817.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/sugofukomudaba.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/kijewatuxiniwisuru.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/40831616add3d6e05ed4072f0f4b005e/96148837715.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/43039489895.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/savetusasi.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/62860600807.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611326203c97d---59801973133.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/28654296895.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/fekisodumarizaluse.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/69531342771.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/doramuwugoguw.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c857b3e47e3---14772472633.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/pogawisapexumajeberoxud.pdfIn PDF document text
    • http://dzbnf.com/upload/file///89015484331.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/69137789204.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/20781399320.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/kavik.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/mufufoz.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/fajut.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/19823606884.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_off0000c6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 11156 bytes
SHA-256: 5dd3a53c0190dca22055ec2d122c6cf3866cdff24d618e3d5a1e55f0b0562f73
font_02_sfnt_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 16752 bytes
SHA-256: 9a482e604352969c1843a73951a9b613c1ccdcb3e10a48ee343c7a65c83223d8

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