Malicious PDF — malware analysis report

Static analysis result for SHA-256 991e390f896098ff…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 18:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3486d10919e7372b810b74d1a60923f9 SHA-1: 32b8a62ccbb71de7b6b2760af1c3fcffd2f777e3 SHA-256: 991e390f896098ffe5f1f56b3935e82a370d3c9ee4ccfb0e68e4b398467fc159
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and numerous links to potentially compromised websites suggest an attempt to exploit users. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b5a4924d6b7fe2c97416231b95acd67e/43300052074.pdf In PDF document text
    • https://cicadit.ro/UserFiles/file/41259213543.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433a309a0f2---92714859670.pdfIn PDF document text
    • http://deforma.it/userfiles/files/95326561990.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109010015592189.pdfIn PDF document text
    • http://orenprom.com/img/account/file/27272957314.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/gojirirunowopekududo.pdfIn PDF document text
    • https://curvy.tw/upload/files/86051963049.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/17175278506.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/3003252094.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/sijojajejaximuvino.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/vasokufumaz.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/gusolew.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2844adecf67253904f8fb4f46c58120f/47704415281.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20998498631.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/19457723516.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/pafemusitojejuzetijitut.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/gobukeselulofolupolo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139e04895785---19478675805.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/2566695479.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e60cc223---46903435292.pdfIn PDF document text
    • http://napiarsaigh.com/images/12798973548.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/nozijora.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/72067541273.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/tujiwa.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/74197654037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=black+panther+tamil+dubbed+movie+download+hd+1080pPDF 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_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 11532 bytes
SHA-256: 5da59c12913acc35503514ea309e75b7cf74eeb1b78d42c811382394e0eaf3ce
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 18624 bytes
SHA-256: c6ebf350aee85c67cb55210e654c3e9ebf1579dfcf6f75b078f6d0868cafd619

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