Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde63a12b408eb9c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 05:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0199b475ac95812af03b50a4cbaaddbc SHA-1: a3495d73c6628d17ac97f17974ef3b9052281539 SHA-256: fde63a12b408eb9cbe8174a3d1de1c7a7461d8c884e26d4c245d6fbe43cd9682
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF link farm heuristics and embedded URLs reinforces the conclusion that this document is designed to redirect users to malicious content, likely for malware distribution.

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://stavclearing.ru/upload/files/84116891144.pdf In PDF document text
    • http://1day2night.com/UserFiles/file/sipupujotoxilujubazogose.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/53199666172.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/rasuvu.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/45115889504.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/71352966553.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/fifolexufexudaxenagoras.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/31676114956.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-09/210909235416209999wxm0tgabsewu.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/pokipotamofagewogodixun.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136d43716d60---76830138211.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/musuzanemunilorowivub.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ac5a4bce---8599872597.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/60849407979.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c1b0f9c87c403089f1a5d1c4895741c/jozulov.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/93848616368.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137ddfdd07b9---ripuf.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/23581828980.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/potovevirurovokapuz.pdfIn PDF document text
    • https://miet.hu/kepek/bakobes.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/wotekoxe.pdfIn PDF document text
    • https://teamcode.net/upload/files/61738272878.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/7002665737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=assassin%27s+creed+valhalla+apk+download+for+androidPDF 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_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 18000 bytes
SHA-256: b21fffbd863971f435c3522fd0bf3e72b7d4296d6b3467065b1fc543168aca63
font_01_sfnt_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 10880 bytes
SHA-256: f669e67e15a2d2ee2b9e12a5029774c96570fb93a0e941a63d4a4edab98aa155
font_02_sfnt_off00011f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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