Malicious PDF — malware analysis report

Static analysis result for SHA-256 205e5d64b9d3c7cf…

MALICIOUS

PDF

95.8 KB Created: 2021-08-11 15:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: cf228794b5a11be2e2abfea1d251a4c9 SHA-1: b36a0d910b5a48fdce93f9fd9131d2be8179b751 SHA-256: 205e5d64b9d3c7cfb0d55b6b7459d45b38fde4f23ba5c2cee56cf9028ccd6dc4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://searchlink.org/userfiles//file/72553957587.pdf In PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/kizurinawevavodevulidune.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0b05ea2f3ca510c650f821e85caf1cf8/pefowa.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/g64ubnkplahsbi05htn3sn690r/fexugijigisojaxefes.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/59725924154.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b5405201818---74552526967.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/02375g44tsmjcqhon8ns3keoh8/96700157262.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/kuzitedupeniv.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/fumetaguz.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/gibamovafepab.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062322314858.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/15632902595.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/wisivewokajopoxorov.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5adc42a31551dc87552d09edb3a71e49/64127475511.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866ad7d6eb1---95018083672.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076cebc0a3f9---miwabisiku.pdfIn PDF document text
    • http://spiregene.com/image/files/20210718_105916.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/zogasagisaxotakuke.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810d56ef4af---bonalikeginepasol.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/91ho37lcr8unns56pe25bo9cio/xovipofupa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/72bb148abb1e2baff0fd7992688ca2a5/70075641458.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/61783243287.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/9c2f11f355fa02158bbc2055afd49366/69377920872.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc7d0bc60549ad2530e28aaf1ca84843/77900999817.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/xojekapideme.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c2f26442b---miwozeniwaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+jominy+end+quench+testPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 10972 bytes
SHA-256: 1fd43ba3610156a423b758294e9360a0f93cb34f02bdb07051731357376997ec
font_01_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000129d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D4 17712 bytes
SHA-256: 591871f5be987e972f38f5a71925927d6e971bc4dd9c2263f6760ec021892f8b
font_03_sfnt_off00015858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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