Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40ae97f34255b10…

MALICIOUS

PDF

74.2 KB Created: 2021-08-19 11:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 511014affde566c20488b9ee00ba4ac9 SHA-1: 792bec8132f5ea9c13bc5f7706943be541b122d7 SHA-256: a40ae97f34255b1005c59fde54b3feb90417a70686296bc6278b35fa5f4512c6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress upload storage, suggesting a potential distribution vector for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aksaaydinlatma.com/img/editor/image/file/danuzoropovigiko.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ol3h5utbooc3cfmj5su672n73o/26481244262.pdfIn PDF document text
    • https://izr.fr/files/karabiviw.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/81060896321.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/415ba60687dbe7613f549e47acfbc548/19284185235.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611d2da7efdf5---buzimoxele.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/55973332611.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609894f450115---80107603094.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/55273044079.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/be5e4a8119c6e8db50bb2e427673909c/puzoletitasorom.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebfc3cfc1---44810572996.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b836e6a6097---lipoduxojamewurapabatitip.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/xinusejumilu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0639f6e2b86fcf96156f742f61298814/tazutaretodopidajuxezuwim.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/59711804804.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e73a4635390b85cc3decb1073bafaa7f/pawejomezuvekozimotekipaj.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/sunebevopepatigaxifawus.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094c79b955c4---gixezabixikopitekusuruba.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/dexodusomogovisitokiduser.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60249e1ece---rebowovetutitos.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608458f009750---voton.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hp8gr0kgle2b5dv9jjh1gpboer/62595824608.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/60566844332.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/eedb5da03b7058c20ef85ba9e63f9df2/61222431621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=maternal+and+child+health+nursing+8th+edition+study+guide+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/fitudamejapaz.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_off0000be00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE00 11312 bytes
SHA-256: f019eac6bcaa725a3b31483364e897d03cbd0292a0a5500c847e3871b503ae0b
font_01_sfnt_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 16112 bytes
SHA-256: d33ac19755995d1e4819eb978b25a9536d0fe2aa58b75deccad79881f57c0a9f
font_02_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1