Malicious PDF — malware analysis report

Static analysis result for SHA-256 630d6d45f55d47da…

MALICIOUS

PDF

70.7 KB Created: 2021-09-14 04:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ac607a076704d0acca5b3cd69c99a64 SHA-1: f7c207d41bf044bfbe03aed8bbb702cf5ea9d5ca SHA-256: 630d6d45f55d47daccf5441868742685a4f1456e874b97d46f0e71cda66c9949
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

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://wastran.ru/uplcv?utm_term=how+to+change+ios+to+android
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161306cbc46810---lumowete.pdf
    • https://eletvital.hu/uploads/files/50783622137.pdf
    • http://hb-hospital.com/file_upload/fck_upfile/file/23634073875.pdf
    • https://conrays.ru/f/data/24824703631.pdf
    • http://jinruily.com/UploadFile/file/20210904121808284.pdf
    • http://powerfalcon.net/uppic/files/rowane.pdf
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/lifawemafewisapa.pdf
    • http://reichspfarrer.sk/file/40839338973.pdf
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/xiwin.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa5de7785---64299150493.pdf
    • https://isleo.com/i_photos/file/17566763984.pdf
    • https://motoquadro.de/userfiles/file/73522015589.pdf
    • http://elverum-revmatiker.no/images/file/74997165564.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/vedesowovuwe.pdf
    • http://archpiudue.com/userfiles/files/96258612512.pdf
    • http://hum-lucknow.org/test/fckeditor/file/jewaguxedelapuwure.pdf
    • http://gndpta.eu/news_objects/files/88518905989.pdf
    • http://liavanhaeringen.nl/userfiles/files/titomekemubotateroge.pdf
    • https://www.leasing.net.in/ckfinder/userfiles/files/murux.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ca021e31a5852f21d174b7fc642d6ef4/75511242727.pdf
    • https://kaparatt.com/images/File/50027470383.pdf
    • http://macierz-grodziec.org/files/file/8838406671.pdf
    • https://habibitours.net/ckfinder/userfiles/files/sonug.pdf
    • http://miydz.com/mingyi/images/userfiles/file/dajepelugo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b65f.bin
c01ec882fc7d27ec6a4f6de5bd8d05f57c2c7651cf281c63cd43b07d4f37b800		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB65F 15064 bytes
font_01_sfnt_off0000dca6.bin
9d6c5ed30108e19b48f77db25bc7c2875079034bd293c64eeb8f5934e96bab3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 10680 bytes
font_02_sfnt_off0000f4ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 16792 bytes

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