Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc30378019a9a50…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 08:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25dc7b2955e19f2e78bd265fc16bba5f SHA-1: 46b1f22b9ad2ed14430adaa39bb662c99d1638f8 SHA-256: 4dc30378019a9a5052e566d4e9ecb86a4b6391a5cd13715f84b1c2befab4a625
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://oglethorpeclub.org/~oglethor/UserFiles/file/wigasitulanox.pdf In PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/silisibutafaduwe.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16313477128686.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vitkqodn9fa8rvtffm4qnhlf72/68304998546.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365d850bc48---zajek.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/jowawemawenedomokibaxu.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/50550625538.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402cf5da9b0---jametediwokoro.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614042731baa6---44950586209.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/monokikerizekananepusoru.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/79219371473.pdfIn PDF document text
    • http://kdekdyjak.cz/data/23571577747.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/gabosemelebavojijenes.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/xuruvixafe.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/k62efk0b7iffh2qg10mokanqha/gedokejiwulaweg.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/57357657356.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/3661835312.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/zoberejegewezowifutan.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/33644638249.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/42826606907.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/69293075203.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210904_041352.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-10/20210910050600325019.pdfIn PDF document text
    • http://csp.hu/editor_up/80470164138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=top+10+pokemon+rom+hacksPDF 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_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 10632 bytes
SHA-256: 99d3727833530cde4ca0654657c215a701bee0c7620c4f3466827b7aafcd5af5
font_02_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 17860 bytes
SHA-256: 209ab4c7a09e73e67f45bace5726552be84d72164e892babed3f584ad1ade381

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