Malicious PDF — malware analysis report

Static analysis result for SHA-256 498d327b70536206…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 09:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a37a0601416e5ba7400cbef14118a9a SHA-1: 41f07e8dd2a544668d96b0a72dc1b4548e9aa707 SHA-256: 498d327b705362061a40633bf06042e858a5f8bb8b7d1c1f974f9d75c7f1be7e
172 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm, directing users to various external sites, some of which host further PDF documents, and one of which is hosted on compromised WordPress upload storage. The presence of a visual download button further supports a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bloomx.com/sites/all/sites/bloomx.com/files/38577070341.pdf In PDF document text
    • http://www.globalnautique.nl/upload/files/rajavawenirorajobibixesu.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/3744807587.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/8892307770.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/00ba2c9b766e10b49db95c7ca2478948/45482565146.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f265dc46a4---1653623621.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161349df5be02c---14266338238.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/sotuwasul.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/63165762293.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/fafukifipomuratajofejuji.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/78819233451.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/mabivij.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f319b7f7b9---62832126435.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/duzuvoparavaguwosel.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/86704808539.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/5408649640.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/wikivixigosipenenaxoraguj.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/mukejapepumifojarekelu.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210905075825.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/medabenapuligutigapuk.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/vebokagigur.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/68132743152.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/wugakasipibafiwujun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=idm+lite+pro+apkPDF 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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 20308 bytes
SHA-256: 8e9140fb2790691a9d2893ced651c2b35a30d06afa4319e9b9b8c492aa0ba9de
font_02_sfnt_off00012940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12940 10324 bytes
SHA-256: 0d44309152d9d803d3da053cb09657c450b464cc8865094ba66048d7c6ca845e

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