Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7dfeff232cd83d…

MALICIOUS

PDF

83.6 KB Created: 2021-06-29 15:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bffe2aaf094a319e4bd5c5a63f4adad SHA-1: 1d8b63b9e64d226f254a20f7ab695d569e51e22e SHA-256: dd7dfeff232cd83ded6197b2f332b172911ea7e6a03803d4355b043b786184af
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://benthanhsgfarm.net/images/uploads/files/60756353834.pdf
    • http://yaeram.com/userData/board/file/jinevemexupesusidifevub.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5da0f298d298c5445d34db96a8f920ad/sijalew.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/90757550c80052156d6442273265e0d6/xevirepinugezef.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075faa13e22e---gikopubakidafowenupofu.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02ca1f080c---fuzisikadiwiba.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5956e7aaae---bamegisozexufamadifa.pdf
    • http://inarchengineering.it/userfiles/files/27155023945.pdf
    • http://wwstationery.com/files/file/marezasiweteza.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13f4ef606---negof.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0f4e7cfc---mimure.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0dc7524aa9df4f80eb3bc88636a3bc13/18900225048.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/327dd41099d8471d1e6a0edd28aafe49/27196695415.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/c9dkau1j3tukdu2c3take8t0cl/difuzalufijifasedanomiseb.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fb406a99a---wikotux.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8c12a71c2---fuvosawowipanenox.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905d1dca97a---rozikerazovavefekisuvem.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/23ab970d560bc96668fa10a73b25b055/58328930238.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/91ac46b9e25780b869d3b2b05619277f/vulewagemipufijubi.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/19117612250.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c415bc3f398---46735599511.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+encyclopedia+of+technical+market+indicators
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/31bc8130df01ffea1882aa0e9132f04d/difemoranazine.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_off0000e392.bin
7332e5fdc14cbd458c626c7e445105289d5013bb327a4d32cf45b237ed554df4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 11056 bytes
font_01_sfnt_off0000fd1d.bin
945fae43c9580a490b69fe1895bbc603193c02f5f77499d6587dd5a2742641a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 17024 bytes
font_02_sfnt_off000128ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 16792 bytes

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