Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd08178b4f357ba9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 05:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7ee69553aac15b58502f213ef9befe9b SHA-1: 8be2cb34121fcd666ac3abd680ca291fba35a7d0 SHA-256: fd08178b4f357ba9ffb2c8c50e2cd54e17827f4c199866df7390e85d841881d9
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm indicates an attempt to lead the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://cloudinfo01.smartevolve.com/images/ckeditor/files/kegijugip.pdf In PDF document text
    • https://autohausnschmidt.de/userfiles/file/sijuxuzuz.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/jasitepudud.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/6b1e875b3aeee1bd38943a7810e05159/7742140242.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/qud4mltedpug0krv17o5c2kfs7/80311243070.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16131c75611d37---tukinarogelutixezedudelon.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/leseveroxe.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/nomalexeladowetuzepogit.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/tugagixunuperebamafil.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/69057845615.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/zilasavul.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/vojofu.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/27957881411.pdfIn PDF document text
    • https://sanagustin.cl/files/belibodatojezixisevowo.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/46591706448.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/96660358560.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/judekavapiwelazekevaxusef.pdfIn PDF document text
    • https://anaksemut.com/contents/files/surotowusisofex.pdfIn PDF document text
    • http://emaaravm.net/upload/files/papanovogasezuxoxob.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/48730747887.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/xebudibozaxirelu.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/bemole.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/jowokexulopujanokemet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=can+internal+storage+be+increasedPDF 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_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 17656 bytes
SHA-256: 0afbf5ba3ee02113c2d351d18e64e961a349a139f4bc7ed58efd898defa23836
font_01_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 10716 bytes
SHA-256: 3b7210c2cd306baa0dbc94f6927a5350e98c113c2837b1131205538e2c301a87

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