Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea2b05c7eedaa8b…

MALICIOUS

PDF

94.4 KB Created: 2021-07-02 02:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3babaf784c38ba8f167d51aa1610e9e4 SHA-1: ea2964d47629d0ae72cc0305b72c46bc4d48d288 SHA-256: 1ea2b05c7eedaa8b114c87462fad13cfb88df3840be0b7f3d85a9c9982375cd8
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites. These links are likely used to host phishing pages or distribute further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e10bb72bd---tugipez.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/38fba91b402a96e485a9d1149f55ad86/jekuxakovepesevi.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21400d992a---63517534069.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079810a25231---1967432613.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e1c69b7d---pedifewevogigonano.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3da2ce98a97ea09ef5e48deba6524f63/zekawesiwomakunekedagewo.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dc8b14a7e---49354513590.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f1a0f0e8915885e4bb5a47920ae0614e/fenazepemokelilijatizum.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/bb7dbaa0ed3ac4a3192b84b24b5f5c58/22287497403.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/fomoliliduluz.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5ef4a794---xamiwazedomaromurokobi.pdf
    • http://kvbm.org/pds/userfiles/files/pesoxijokagalofadigemilat.pdf
    • http://vksraja.in/fckeditor/upload/file/88999325989.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609899c8ed01b---52215781899.pdf
    • https://soechi.id/userfiles/file/51151160020.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kubexol.pdf
    • http://veraschwemmle.de/fckdata/file/38022578869.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160852befbfa8a---fojupagoxorofisadagajuto.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e599b0e0---56673287407.pdf
    • http://mytmbc.org/fckimage/file/nudopivotapamajunaruborud.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/42ldnsb3s6dg0kk789sl85m39k/93913784837.pdf
    • https://dunaweb.co/bg_image/files/bevadimufu.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/t8muo9kprfvgrccqmc1d2ufqrp/jinamanafagaxajop.pdf
    • http://bjeclinic.com/ckfinder/userfiles/files/52659989893.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pemphigoid+in+mouth
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f873.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 16792 bytes
font_01_sfnt_off00011085.bin
bf7ce557449cf4db82013a2acc179b14d7651053b2bdbf5f7839f705dfd55148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 17836 bytes
font_02_sfnt_off00013fb6.bin
bdd2132f63d810870548c5883ac353136c71e4aaca2297c32dab38d6aee36cc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB6 10464 bytes
font_03_sfnt_off00015703.bin
98bcec2be85b547d266a48c61dccc50816b624367bf69e2f194f2b8087d010f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15703 16092 bytes

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