Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa887d153231a2b…

MALICIOUS

PDF

89.6 KB Created: 2021-08-10 02:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39311ca84a6309a5876e44757ede5345 SHA-1: f898c98eb54ad0e07a0692d4cb12cdae0a5c0f6a SHA-256: daa887d153231a2bf127282d9f52bfb06a1b8b0134af32934887db67ae193228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised websites and disposable hosting domains. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to distribute malicious content or phish users by leveraging a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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://vansuloi.com/uploads/userfiles/file/2586375450.pdf In PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/52280788740.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ce665382c18a03e8190ec58b5e4b2da9/tusuzilepawufili.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/jisogowebujukigifeki.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/70710060829.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29591042170.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/11dbdfd5219a24b19e280d9298c61a87/36769578921.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/65410443009.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609826d8c4e3c---timawegotow.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/wuloxifidonodisaxupaxelu.pdfIn PDF document text
    • https://masihpt2.com/contents//files/liritepakek.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609875fd67aab---95045579282.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/lajapedev.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/c4filapif4s3o5al1ktkf4ip2i/7570429835.pdfIn PDF document text
    • http://dichocungtoi.com/userfiles/file/23770035942.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ns55qpll0pt558re97kv829qcu/gekabuledesilotamiso.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/wekuvevekab.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fab08a585c---73802598621.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/dafetatimazixebogibujude.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/peborozuvozesekedegiliziw.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/41551813528.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/62947054638.pdfIn PDF document text
    • https://hagepoorter.be/files/files/wuxaxufufu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd879e31f9---vivetokawoxilidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+release+husky+ratchet+tie+downsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 10848 bytes
SHA-256: 8236f513a8c06610b653b292df59654da8e41e0e247ab7091cacf022a7cac936
font_02_sfnt_off00012932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 18048 bytes
SHA-256: d8b6a0b8cbd18d2806691cb528893fbd87de06173c870b3e8a83d71fa6c2d970

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