Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d8ddf481f0e3c6…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 06:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84a8b7111d0ed7547c9a6acf5eea3704 SHA-1: e541ec880c6ce32bf97a8fc6dad74902544fe576 SHA-256: d7d8ddf481f0e3c61761a086ce53c088ee55643e6791baee61880847ffdf3477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to host a large number of links for SEO manipulation or to distribute malware.

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 https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b30c0fbf15eac2ad7ca5e54ba78e1a4a/jiwalijaxugivevosig.pdf In PDF document text
    • https://dolupin.com/calisma2/files/uploads/fugigobatudibijerazani.pdfIn PDF document text
    • https://ibextrail.com/editor-images/99920336767.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/zanuvebebanajujezaz.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f0b0bb62e---7993227888.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/xipoxolodeliresebabemex.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/suwus.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/81676945388.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/tgv2j5vbt6151u17dq2dnlep6g/fatakebig.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/penelugu.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/soberev.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/voxix.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/c4a91b5f7bf3d714be05e16dd60c568a/85571498429.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f62216b6fa08d4225124f1f47e3e2414/mozofigareponofefatapak.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dcb707e73---36763494726.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/23059090329.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202108200203227059.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/zemupadupezenopoj.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/sofebifilasafulevu.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/48596924404.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/bisikefevuwe.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/fezofadaraju.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaac8794e1---fifixigizerisuzejifosoku.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/72308542772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=circuit+training+handball+pdfPDF 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_off0000c916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC916 17160 bytes
SHA-256: 1592a82a64ee37a7ec7133a84c9295339e80c4f248df22f8f4c8f07f2de005d0
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 10748 bytes
SHA-256: bf63b9565b936e8484886473bbee2ec6d98443bb6a835ca7fae7b64a67b81d9d
font_02_sfnt_off00010de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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