Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7d144a820bd357…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 03:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb72c4a893b11870eb5ef4fed9f6bc92 SHA-1: 15787c757ae7012e84fe23381aae60c504776dd7 SHA-256: aa7d144a820bd357532b08d858ee7afc6b7fca7755af1fb662a4b32276e2edb6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics reveal that the document functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. These links are likely intended to deliver phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=rubber+stamp+paper PDF link annotation
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0686fe2e2791e555215f06565ba8398e/gipokemuvolagiteduzelasop.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fisutemigezodarisa.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/5f8a1981c1ddac95caac408e0b675b00/kowutejaz.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/ludelus.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5b7enbvcts7ss8375ubqumhcj6/boxipabixipeninuzota.pdfIn PDF document text
    • http://ccl-ciecie.pl/userfiles/file/52110833953.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16072992c40ed5---20557748696.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/76f4d7a2091902b42fe0c977c080e685/38081308552.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/funixozapuwi.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/82520026911.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ee2n5017vn06pab2ilo9970taa/wefitajekuwagifalelufibir.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607634f66d179---50141868126.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5bcf6869a---51175347270.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/8859d14d91a1970ffe2653b222bdcef2/18235375539.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874c5b32a1d---91282080909.pdfIn PDF document text
    • http://fitviewer.biz/files/file/larabawapapafikej.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/gogogajovelinos.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/7264861121.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/mevukovevegel.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210710/16258587701277.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bcabd674d---lefuteresilusedodide.pdfIn PDF document text
    • 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_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 10336 bytes
SHA-256: 5029485635a1c1ff5aba60dc0355a6988e0c87a93c7c645243d49b9c8556d455
font_01_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 18328 bytes
SHA-256: 451403c1cbca67c38d732e0926b7723079a24036282e095d1deb5e13cddfe00e

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