Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94d97058fc6c5f5…

MALICIOUS

PDF

74.4 KB Created: 2021-09-13 01:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76594b6a671cd0882610751ac3b9aa90 SHA-1: 62da1ad746d7fffe25cfb68884e5f674fc4628fe SHA-256: c94d97058fc6c5f5c2dc5de28299a2a5b2b8e5ae6ec3dbaeb76ceafff96a5a9a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript suggests it may be used to redirect the user or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ketchas.ru/uplcv?utm_term=how+to+update+play+store+from+factory+version PDF link annotation
    • http://1hozain.ru/files/userfiles/files/midol.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/3633579438.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/xefadumalulazebazi.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3841e115e---fimalifis.pdfIn PDF document text
    • http://dentherapia.hu/files/file/75028174133.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/8391669886.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/wifogegolidizojim.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d936806581f7cea4ac6ace35ae67c4a1/ludozokapotobab.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/73476030920.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/sejokajiniretok.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d90a2724672c2359365a18b3b2b4da0d/namidamesasopixugumadiwid.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/wijisativumefuwaxuxupitob.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/pexutawiwuv.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/47662706709.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e74d65ce8a---nutikugeduga.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/zudakuruzubemefon.pdfIn PDF document text
    • http://kes.org/upload/editor/files/12107663580.pdfIn PDF document text
    • http://qdcmd.com/data/files/61172186490.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/regafuzo.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/batabemerudafoki.pdfIn macro / runtime command snippet
    • https://skywaynepal.com/userfiles/file/xuriwalukipejiveleguji.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/71933715721.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/nefujanok.pdfIn PDF document text
    • http://agriturismoilnocetIn macro / runtime command snippet
    • 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_off0000bf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3B 11136 bytes
SHA-256: 22e259d41ba9d994d3f2891c1102cb496510d48eb83079b668c66259166af5c7
font_01_sfnt_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 16572 bytes
SHA-256: e1273e91e49190f717654db84e1b9c4882d50f9916d825e6d747139f3a26efaf
font_02_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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