Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8473b1bf8b1a99…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 13:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d2df5a91cc40d8ccf253530da9b305d SHA-1: 2e76175d380f3c699135d3e156bf3bb5529321c2 SHA-256: ec8473b1bf8b1a99c1d56d88ad74c00881ccb720c2a7f42f7a99f5f7da0d102d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest the document's purpose is to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160856a7adc72d---99418575589.pdf In PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160985c9893f31---mateloru.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/59803617142.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/c19c353775d9d754c37263a1ae64cc4b/92255217273.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a0119e41e---36804071922.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/24049915987.pdfIn PDF document text
    • http://absigorta.com/E/file/lowuxizomus.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160750da417efc---zakamu.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/mivusiromugazafi.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/15703028139.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/vajomaluxed.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/xixerujisopulimuxulerubog.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/gexiluxuduruxoguvipi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610d91bd86b89---mukisebuwu.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/86188818291.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16127820e446eb---177130016.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/lopobonorazutojamasoxuri.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/jutoxujujekexuwobojojil.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/64944154550.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/ruzunuvonokivadufa.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/rokavuboduwixiw.pdfIn PDF document text
    • https://noventa.cz/media/files/file/zexasalipexefopisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=year+3+mental+maths+test+pdfPDF 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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 17152 bytes
SHA-256: b0facf0c982d5d19e7b551c4a838d6ac20c2198b571afb7af6c3b6bf1610911e
font_01_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 10708 bytes
SHA-256: 2b7bb69e80b5de48d4c1278a4f2fd160bac77ff7f776842d3cabbf36e7a84e65

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