Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2d14a038437ce1…

MALICIOUS

PDF

98.9 KB Created: 2021-08-07 01:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c6637fb90951969ad5e761e879e991e SHA-1: 0eaf02e14dcdaf5c5163a6c48e78101429b8884f SHA-256: da2d14a038437ce16d7dbc4654a411e524592aef8760b4d8bc213377d1dd59c0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier also assigned a high probability of maliciousness. The document contains numerous embedded links pointing to potentially compromised CMS uploads and disposable hosting, suggesting an intent to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://canadapremiumlubes.com/survey/userfiles/files/6512858254.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844678da1e---begosovogowojufumuf.pdf
    • http://mini-garden.ru/userfiles/file/54724596624.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/l97khr7f6i1fanvjdrb241q2i2/66787365976.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021062905152580554.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c9f923ae50fa92b91baf6ddbe098112d/36766248335.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858a3b7baeb---gusolaxino.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d209d4b357d---dolavijogelorowufoti.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d1e9af1d356d15db4c13c1248bcac211/63521141140.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160818580b3054---faduw.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a195b394cfa---jidemonafe.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/84a6v1pvkqc0l2pomap7679n07/81272078232.pdf
    • http://zrdb-drogbud.pl/Upload/file/13934967489.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5757976bad7b82cc43886a7b489cc987/pijajamalukixutunikuke.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/59224afde1e1b580435f541da852b4ab/vamujufaribilejunim.pdf
    • http://intergeored.com/upload/File/wemov.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=la+institutriz+y+el+jeque+pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee89.bin
e736ecdb0b74d31da3e3c037c9f9878ce56d4c686c5a52b9f92ea4226d3e0227		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 23060 bytes
font_01_sfnt_off00012747.bin
acfdab59dfbb777b8e96e4a394f01233a824393009e8cd7c7e741087e1742659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12747 2576 bytes
font_02_sfnt_off00013257.bin
ed553b4fce60c51079543d424a842b9f7290d4d517b0fdb28b2e0f35d367ac55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13257 16680 bytes
font_03_sfnt_off000149d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149D9 16792 bytes
font_04_sfnt_off000161f0.bin
9b4e3fc0d823582990c8031aca94a56769b92bb22e1c1292c7a72603267a7b84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161F0 10876 bytes

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