Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a2c0d325498181…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 04:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 324f7f41ed23fd493f1802130952f227 SHA-1: 16420d1f053354a8b22af34d836786fe38561a95 SHA-256: 16a2c0d325498181b99de6d7e0494caf9393b62f4f75ec941996ede467948586
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. This suggests the primary purpose is to redirect users to malicious content, likely for phishing or to facilitate the download of additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://ms-beauty.com/ckfinder/userfiles/files/wisetixuzomibebewezexoj.pdf In PDF document text
    • https://blnk.eu/userfiles/files/gebawosirudanivuze.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/cbf463fcfa868d07d19778b7316992e4/pafelujejuxusomereposu.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/82336467601.pdfIn PDF document text
    • https://educhina.mn/editor/files/dejewutef.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/majoziroxudejejoz.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210904041455.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/hrs7ldg4i00nfllgb7uq5mm6jh/kekasurakabojozomu.pdfIn PDF document text
    • http://topstec.com/d/files/70803685887.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcedd8550f---32730991803.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f84ab0413---japaxafurigutaw.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/madidexatavebufogimesu.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/kagifezutigijetuz.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e9e11454---zopuvagino.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/samakabozupixepowu.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/zojove.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b4a1a8875b9b2ce4f971b4b39881a862/bujotakibofanowebunubin.pdfIn PDF document text
    • https://gangnampools.com/contents/files/disegikuvaver.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/jibibujivanaxo.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/daxeloregakojunoxifif.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/sogopuvukizojokovo.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/jirupujeb.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/eac469f41eab54f98e402852e4241e20/zadojanulilawujirakojeb.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/tofijilasitu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/30849019444.pdfIn PDF document text
    • https://datawire.gr/files/files/59649482902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=redmi+new+2020+price+in+bangladeshPDF link annotation
    • 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_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 11256 bytes
SHA-256: c3f1c45146587371e2a07c47ee25e047b19c43758cb2b2626835dcac4b9ef26b
font_01_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 18776 bytes
SHA-256: 798c587c4ad90274dfaecf29abd06b6117c5604ddafed80b6846f1c132612ada

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