Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf84ce22644a87b…

MALICIOUS

PDF

89.7 KB Created: 2021-09-08 11:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 858c4829957167a8bc2898121d07fe3a SHA-1: e42951b45e8e918aa0ee7af7b74ac5a15518ac39 SHA-256: acf84ce22644a87bc05c03bd09ef5d44e5a4e1b784fac6aba713745c193915ab
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, with several pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://etre-belle.su/images/file/nagodopuwuruwi.pdf In PDF document text
    • http://ankaser.com/userfiles/file/zemusajusafimezatar.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/13994645364.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/gejigag.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/wozajibibimowek.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/4065818197.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98135857506.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ecbqd4m6oipv3f1idsh5355bp6/16066951780.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/filotugozawagizu.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/90797320972.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/mee1uc6c1g0ucai07jha4t59o7/kizozugod.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/pedosit.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/26726093910.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/newaze.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/96575192854.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a7cde7caf---74940566436.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3c5153dab---4773372269.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/lobufugavomidufapopexozup.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1d44138ed440ff33b043559ab3e21780/25743533115.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/25377366890.pdfIn PDF document text
    • http://short-story.ru/upload/file/moruzododitijatuzu.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/bebetesugipulisu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qmbe7eo7mi4v4h8drdvmnhrto1/72802706911.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/wurusadakuvorewedoxeledu.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/14496744537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=displacement+velocity+and+acceleration+worksheet+with+answersPDF 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_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 20928 bytes
SHA-256: 8418ab66c6337cdda54eea59c82ec8a4f4bfe1c76bb06e350b83fa7ba2f61dc0
font_01_sfnt_off00012617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12617 11136 bytes
SHA-256: 85af31979ae5f8dd962c1cd961ea48411088cc4505bb863e4b728f2424b39a71
font_02_sfnt_off00013ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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