Malicious PDF — malware analysis report

Static analysis result for SHA-256 412f40f4212b21e6…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 02:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2732c8d402d69d1effb79d594852c8ea SHA-1: 8a134caa859575ab34289698f86330af6e63c492 SHA-256: 412f40f4212b21e6a2452fa4dde7e068158ffc562ce0bc94b0229464b2ecb3e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=kid+active+triangle+trampoline+assembly+instructions PDF link annotation
    • http://canavesiobruno-architetti.it/userfiles/files/64651156820.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/fusanux.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/43775164121.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fc8c19c1c---87193158281.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/74b9da1f7f81a1138da49a61a654c382/72554480011.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161170b8edc6d7---degitugamek.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/volazimavalogaziluwi.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zagipedu.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/60852555628.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/vetugamavopajutesod.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/44rmase4bbuhakmtv1lp3rsdr6/5372774850.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/jepovilakofefiwupo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfe55414a---fafuwowunigaxudukibax.pdfIn PDF document text
    • http://lucann.com/Upload/file/19623335755.pdfIn PDF document text
    • http://d-innovation.com/upload/files/wejanekotazezilixin.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8be02649dc---kazujapiwu.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/vitowuretebimifokozerula.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/99914014548.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/japudazawoniwaxoranubeveb.pdfIn PDF document text
    • http://goldmustang.com/files/files/kirubebukadapemiwij.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e724117129---82815600687.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kgdtpgn56f8easphlku31gp101/sujebegixoxage.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/xudulolajo.pdfIn PDF document text
    • http://greenld.com/userfiles/63056817334.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/77702648523.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_off0000c8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FF 11268 bytes
SHA-256: dee1958dd62c2a9a25de5cee237f494fb136a117e10641634662e43695401682
font_01_sfnt_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB12 15748 bytes
SHA-256: 3024f9299af8cf0babd40314da0d51f1e69b37530d65dbf946f6cdb31356635f

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