Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8843263700ef04e…

MALICIOUS

PDF

80.2 KB Created: 2021-06-29 22:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 677b3cf3f7ce008d165ab53246bc7ac4 SHA-1: cbcbe0e95e9ba50373d73af737e074f032a4627e SHA-256: d8843263700ef04e4e2c3778115d4932fa933a834a77faca5b88d2b4c479fa1c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of malicious intent. The embedded links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/khb7icaq35vh5k43p9ftkn1g0u/dolekefep.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1c3cc7931---kinimozewobat.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/susanevijaza.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160812de0275c7---19315952359.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/dh0g1l9fuinfblff9u69ujfcd1/kugalaririxoma.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/96049028567.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0086586babfad1796e8cb1bcf9655276/38332549424.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/dba3e56f73c9e9e9b20a1741bc3a9c6e/xozole.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea35cc9cb6---47787095869.pdf
    • http://donauwell.at/userfiles/file/kofurozej.pdf
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/kalalenenisuxosilo.pdf
    • http://asustainable.com/global/file/96796211187.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609305fe2c4f1---xetobo.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/p805tol0l27f7rmgbc4sldfstl/tufelaxorubabatarefena.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb7b37d1c---364588770.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/45170218123.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/fb1fc16dcba3ba73d412b6b1df16b8f8/lavalebekekifigezederizar.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abc98751c0c---fumigepodaxakuf.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/83326747032.pdf
    • http://ferrogep99.hu/static/media/file/refexarofijepo.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4811c7c6d4---63498367072.pdf
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/66444451372.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b840d3ca---7453691204.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4c2532aafef6d632ebda3d02e238c7f3/20385474314.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a753d6df5035feb6cacdabb7da653cff/gezanigafetofakutavi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+do+plants+need+to+grow+ks1
    • 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_off0000d521.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 16792 bytes
font_01_sfnt_off0000ed33.bin
5cc99265f83ce187858599fe8a7863e3b7758e0bc1edef5dc939da7ee713e341		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 16792 bytes
font_02_sfnt_off000118fd.bin
5f99046094396765c6a799289246c2ed93e66824496b5ab449ff279212e7515b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118FD 10804 bytes

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