Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2b7e6561e250c1…

MALICIOUS

PDF

77.5 KB Created: 2021-06-30 20:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 837b05cd22f7f02c33d4ace1f081afe9 SHA-1: 086c81cba56ade48fcac0ed2950ae8d96ca49c6f SHA-256: dd2b7e6561e250c1d175d1427e31bd452616047f568ae4900012df745de91eb3
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded links indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://matsonconstruction.net/userfiles/file/nebojugapud.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccb8a32a56b06758a317b74cdbd9c16d/maguraxemixuwirovarezegon.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/2a1939614cb4d60545c775fa8ee32f64/sojadawefefapat.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sf1ll7q72t5i421eo8ap3up4bh/zabuxomozavikafif.pdf
    • http://solamsys.com/userData/board/file/pazip.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e622e76c77d6d8ea1e2789ba728ea509/xulowutowadova.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a86503ef4ede8990ec65af1433e0f77e/78869082568.pdf
    • https://giustofiori.it/file/4403437151.pdf
    • http://otoozevran.com/resimler/files/14065229004.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/gitezigetuturam.pdf
    • https://vicotelecom.vn/static/source/images/file/lenabiwiwudofi.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/6tdt6b9pb3q31vbu1g85noacb9/55220394845.pdf
    • http://www.aadhar-interior.com/userfiles/file/50860629729.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d266776de48d827428298b5e6850ccd2/47608859510.pdf
    • http://grupopiscis.com/upload/files/81793064822.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qe3e0u2n2l572bk0em5m643p13/96184596979.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607949831fa65---10270876747.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/jisuzijewamigefugul.pdf
    • http://abbuffalowings.com/uploads/files/30515960298.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b324483d602---2574343055.pdf
    • https://tusenfotingen.nu/anvandarbilder/108/files/tisut.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609233735cd4e---96802907861.pdf
    • https://anukulagrotech.com/userfiles/file/xozalipodadiguzonepebobi.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac973f88655---vorejipokujagokeluxomiret.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=will+take+some+time
    • 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_off0000ceef.bin
8d08a37253a04f7db47264d35159c5ae5e8c81deb778442ef2a3ea09aaa5db05
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEF 10152 bytes
font_01_sfnt_off0000e5b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 16792 bytes
font_02_sfnt_off0000fdc5.bin
31fcd95c50d5ff9bec1b231ff67c695e52da624152e05564d6fdaed6392070aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 16332 bytes