Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1975ad22eee833…

MALICIOUS

PDF

70.4 KB Created: 2021-09-01 09:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7670fb3a9742f717de3c46d1351cbf55 SHA-1: 170431981d0023f97a53343f7c16af57d135c1f7 SHA-256: 9c1975ad22eee833fdcb39b8f3ebc8e0a9844fc0d80bf77e35a6b052af83b535
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript further supports the potential for malicious actions within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e3b0cf196---wologobep.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ee7c8ff78---72124537253.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/pubetozajima.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073f3f4f40bb---96839032132.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/madag.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/44936833380.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c3ed753bc7f626535fa154da06701216/73941597588.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/xudovuwadepiwiwarisi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0adf2e51da---65364946757.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071188194bb0---xerofuleviso.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e4ce214d0a---folobagobevuwo.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/50842351143.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ba5c5db1eb162794d86275c01d3cf192/51717795748.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/kajawuran.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/6909295161.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/wenalozazedapi.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/66947772429.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/af46591ebaefec797304b98ca13b0307/puzetazefur.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qgdqsjsfkpetro10ct8kff5r7k/noxipagizun.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///jufutajufisekufavexategu.pdfIn PDF document text
    • https://efnnma.org/files/file/497969298.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/29828388425.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/44003318509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=examples+of+grace+and+mercyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C9 14324 bytes
SHA-256: f75142f7160253d9a6c153758bd03d173d0dc7b1f6f7a7bf63b438b853be19f5
font_01_sfnt_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 10972 bytes
SHA-256: b13b27346c805e9067d2ccba570222ee57058eb6a01545914f8a4fe4b1b88f96

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