Malicious PDF — malware analysis report

Static analysis result for SHA-256 8540dfe763669b77…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 02:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a71958404f8b2f3e3219d72bb4ef35c7 SHA-1: 3b4a54cd090664ebb0cdd0ecbb0cc667368d9dc1 SHA-256: 8540dfe763669b77406db30a9a7a2533d7706174136a0d8e422423a0017b865c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. These elements suggest the PDF is intended to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=hide+and+go+seek+movie PDF link annotation
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/toxedavizozi.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb0182648---sezasesonepozega.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/48594907878.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f62d62b3e---22552577298.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f81e6e4dd---84522003197.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/tizonumipepad.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/4832554527.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/78759044515.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/mided.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/29391246618.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/13479812902.pdfIn PDF document text
    • http://chpcentre.com/files/file/wigaripilaki.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/nibadutamu.pdfIn PDF document text
    • http://schokozentrale.de/idata/kaboretelulavalumawakuz.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/42940115143.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/8434357412.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/zegarazewe.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/70016793764.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/72307062602.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/buwamujorusufogarufi.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/23478229118.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/viluv.pdfIn PDF document text
    • http://wenxuezj.com/images/File/24540661937.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/zebagu.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/1458476160.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_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 10496 bytes
SHA-256: 2cb20ae2a5b3652d42ce5c56af2050ee162fececa44e1334fe280712c15ac786
font_01_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 18148 bytes
SHA-256: e01a38c0711502f494c976a6f357a1a2ec97567cdb7ffb28ece805d1f5247b0d

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