Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9711f59512d390a…

MALICIOUS

PDF

85.9 KB Created: 2021-08-14 23:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23643d40290dc739687f49559ccfd5be SHA-1: 0b262eed0df9078084fe827545c7cc1de609ab64 SHA-256: d9711f59512d390a668f35b223c532536d80357869a9f730a9fffa8f52868c62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories. These links likely serve to distribute further malicious content or facilitate phishing attacks. No scripts were extracted from this sample, but the presence of multiple compromised domains and the overall structure strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7f1b1bb45---43983560933.pdf In PDF document text
    • http://cl-metalparts.com/d/files/jagopo.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/51314238306.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1e6913aed90b1bfe04e8885c1129b145/95203466218.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/dakeputuvovudubepamozaz.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609015749efbc---dezabu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6798aea6b3---73867643689.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/efqj78j38ugcaod7nkdebied6p/pumozi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608567fac86ba---jidinutorekupanelum.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/37224165833.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3db2005df---movatozisenibuvoda.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/fafojakamagetufulop.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/59a4e27913d4eb1df3340ccdfcac585b/88689866776.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/49426421666.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/kedogipaterawed.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210729_133551.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d02465eb---nigavatajab.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e61bcddad2c---69184988311.pdfIn PDF document text
    • http://ruihuitax.com/files/file/28164021854.pdfIn PDF document text
    • http://xenangheli.vn/public/files/piviferoxij.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/edb90b297009fd463d0f92e231115767/vosasogoxafa.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d4a300493---jenuvavutasuku.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/80899386421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+maximum+income+to+qualify+for+ebtPDF 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_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 17860 bytes
SHA-256: f29f37ceb03eaf893ed739d6516f3bc9291645ade86a69dac3a221839e372fb9
font_01_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 11196 bytes
SHA-256: eb69db0cdc6b1a7a7d13c2d06f28d035a5a498bbbef848249aa628f5054ad3b7
font_02_sfnt_off00013115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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