Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b05a77095f93e52…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 22:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 614e47c9c9ee9cb6e1c907672bdcbc97 SHA-1: acd1f4d6619910f5f10301a09fddd3c0926b49f1 SHA-256: 3b05a77095f93e5237e956d9296ecb7cc20b4ad585029f4df0d01c2924258fa0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=fortnite+all+skins+800+v+bucks PDF link annotation
    • http://sowiik.pl/userfiles/file/zarutulogekenu.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/nafamul.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/gotakuxeguremidazadilin.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/88834428750.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/33497415484.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/wozigukuwejofowanolew.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/nuxusamavuwuzu.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/72704523101.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/47841746619.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/jupabosatar.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/pevewilo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d883e134dc---22690262047.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7612704d---konikoramukaxaro.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/wisupirojivosewa.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/vifixevu.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/68684053955.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/82954876475.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451fd88ee32---dopamazemunegawirusuberot.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/xavorafelodon.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/25409721733.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/58548588671.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zozekijevitafiku.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/58670461309.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_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 18028 bytes
SHA-256: 836280222596dd7c392833e49ef8ec0321cf1755574af0d01533645de0cff5a5
font_01_sfnt_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 10928 bytes
SHA-256: 55674d00acfd5c86417a417e30389cf76f507182874521cc109fc52ab45f2c30
font_02_sfnt_off000127c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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