Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a893b4e97fa789…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 03:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2842b2dd095e4d5fde415a1b046cba7b SHA-1: b1f03285972bf955c53420af3adcf2db7572e168 SHA-256: d6a893b4e97fa789ae2b23dc17fca8681d80c42b23c3c4abaccd18fc4d1d7ad0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to host or distribute malicious content. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and linked URLs strongly suggest a malicious intent to trick users into downloading further payloads.

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.
  • 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://crysiq.ru/uplcv?utm_term=download+hotstar+vip+mod+apk PDF link annotation
    • https://glamweddingdesign.com/userfiles/file/36551846191.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/58132026456.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/28209539110.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/zomageviludadetuperizas.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614262ab5ef19---dezotalepuwobeximopusoga.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/8178867880.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e042785e51---47876119597.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca477b9e4---raxubenisox.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/15/xutojudanitifolubuge.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/90456025553.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/85242032936.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/pafatesaban.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/kubel.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/mesufefofe.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/rilisep.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/begubigip.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/baliwepojolapumawe.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/57566211296.pdfIn PDF document text
    • http://wdnederland.nl/file/61826886999.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/madowuw.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/makiparopa.pdfIn PDF document text
    • http://tayles.com/uploaded/56753962389.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f001bd74dd32acc9abb65dfce423d39b/kodasarikigagivok.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/62818723214.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8ed49df7---29279881699.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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 18624 bytes
SHA-256: 99c348a31de1b7ef2024d799c625822f8b153c920ac428944d007b40b3af9d3e
font_02_sfnt_off000125f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 10772 bytes
SHA-256: 530c520f28989494590c8187d1c981e00a8b260af0fe9e59d86e096f90bd0e53

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