Malicious PDF — malware analysis report

Static analysis result for SHA-256 164eabd88b7e1b01…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 00:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35fe04384acb2881bc4f67c532b7185c SHA-1: ffcefc8814fc943562428913cadff5cb9c33c3dd SHA-256: 164eabd88b7e1b01c1017e5c2265d7e24bc77fff5f61d0127e481af040625fa3
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425abb60da5---denag.pdf In PDF document text
    • https://textmakareknutsson.se/upload/image/mebeworaxadejedo.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/16950379951.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/87413386491.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/jidot.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/70225574861.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614595742e912---38801086434.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/verekigelubu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614063d69c41d---zufixukax.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/63218221379.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/ziduzaxolegibifedigigen.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/ranawelusizotasim.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/wujepinedezewalivojuza.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424d3fa93e5---temazosojad.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/71668531121.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/69882790133.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/fojem.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/momenaxid.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/juxipizorajujesisav.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/wudore.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/voxezegatodedaromifamad.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/lutiwini.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210904_C662D2AB40FF9616.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/volikosopafakesadiwupuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=super+earth+wallpaperPDF 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_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 17536 bytes
SHA-256: 90af03d6aa34931dcf15dd808c532edd4f9f5a89059df9e22866b15a3fd50903
font_01_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 10128 bytes
SHA-256: 5ccc1ca0dd46081359ae8be643c24d255e3c7796804f7ec4aae519592dd48bd0
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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