Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9b2915b3ddfc6f…

MALICIOUS

PDF

115.8 KB Created: 2021-09-17 03:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ae840f837d5c0227a06e7e77b5d2908 SHA-1: 3b7180aa635224a6eea6ed34f51877fe91562812 SHA-256: 8a9b2915b3ddfc6f9e0771134d1a626ae55b4e6884e287a7ed3218c2ed1071f6
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including links to compromised CMS uploads and link farms on disposable hosting, suggests an attempt to redirect the user to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick the user into downloading a payload, likely disguised as a game archive based on the URL parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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 https://pixomot.ru/uplcv?utm_term=gta+v+obb+zip PDF link annotation
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210912_103606.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/12820167591.pdfIn PDF document text
    • http://taigesw.com/upload/files/vasugilepetoxujiwi.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/sisiranojofabemuviveken.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/devukapokomitonuzivigaxi.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/30001809242.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/dosexamokuzavisim.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/teforokowujuwise.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/zunekebavujijijali.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd16540bf5---reletizojefazojosox.pdfIn PDF document text
    • https://ibextrail.com/editor-images/ravetajifinirokeni.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/37005459734.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210905192611040752m7agyd3dig48.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613727ee3f4de---mijedugidabev.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/25081916727.pdfIn PDF document text
    • http://kite-surf.sk/files/gijopaxibapagut.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/52858955730.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210910/16312761945765.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bff17ccfca---82442795683.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142775697e72---serunofewemoloripapumekux.pdfIn PDF document text
    • http://enewind.com/pliki/file/zatiwegibaf.pdfIn PDF document text
    • https://cian.hr/userfiles/file/junegifexunakoluga.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_off000152d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D4 25280 bytes
SHA-256: 4f79280930111191755fe98d3bbce85c846837f66c3c44c2fa40efa5d41a3fc1
font_01_sfnt_off0001936f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1936F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ab86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB86 10000 bytes
SHA-256: 7c999c880a06fdb8bca9194cdf268590a584b4023081faebfcad8fe608a0014c

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