Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e1be5495bd74e1…

MALICIOUS

PDF

87.4 KB Created: 2021-09-09 12:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dc1196732ccfd13ebb11787cbec978a SHA-1: b4b0e2c142305a0a8463b884f3a0cc94f9dcb2f2 SHA-256: c3e1be5495bd74e1763044aa46fa267b3c9025066d3e5f463f248d93bbeee6df
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a high number of links, many pointing to compromised CMS uploads or disposable hosting. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious websites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bdd368f7---88631962239.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/auhqj4e7vpui58l470rv8pk698/76734751362.pdf
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/31456254650.pdf
    • https://clicksnepal.grnca.org/img/files/files/wokagogelodajudokiva.pdf
    • https://lhorizon.ca/uploadHorizon/file/22614740805.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb4264ded---tifepifi.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/6178745868.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/gawisajokarubepotirotig.pdf
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/22789976292.pdf
    • https://karolinanowak.com/userfiles/file/rusowewelisirolulus.pdf
    • http://edins.net/userData/ebizro_board/file/loxiruwajawa.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133c2bf68353---32347794014.pdf
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/lajan.pdf
    • https://charming-dc.com/uploads/files/202109081222064344.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/besokokirijidoluwuxekeze.pdf
    • http://transcash.com/ci/userfiles/files/nupus.pdf
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/widiporibixawagelup.pdf
    • http://kasintorn.com/images/upload/files/pijodipimixisigolanapa.pdf
    • http://enidental.com/userfiles/file/20210904123058.pdf
    • http://wronba.com/uploads/wysiwyg/file/88580775615.pdf
    • http://captainkillmite.com/uploads/files/202109091059163602.pdf
    • http://guerrazzi.info/userfiles/files/jolokogugofulaxerawajaxis.pdf
    • http://studiocastigli.eu/userfiles/files/30836440230.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+free+instagram+followers+and+likes+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f066.bin
8c498320c4b9442ddc314b7d726eeaa709e369b03fb3f3210cd8f0e67d106fb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 11020 bytes
font_01_sfnt_off000109d8.bin
155ea2f3e523c36376158f7813f3b69106c91ed266d9ba193b27e642c94baa11
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 17540 bytes
font_02_sfnt_off0001379d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1379D 16792 bytes