Malicious PDF — malware analysis report

Static analysis result for SHA-256 4755e8887f6f7540…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 02:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a9a6ffec9be4acf92bf9cb1dd4b7a97 SHA-1: def327e1ec698eb6cab0ad673654f3c4641f614d SHA-256: 4755e8887f6f754056d540ed27e95ab80571cd0f9b6ddb8822ff96c59d30c9aa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristic 'PDF_IMAGE_LURE' indicates it's designed to trick users into clicking an action trigger. Multiple heuristics point to the document being a link farm hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://cultureresortpokhara.com/assets/userfiles/files/10912762609.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/34b616ba7aa182606736d6b09c766cd2/moxet.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/a829gj0gav6j7pu4746vj52ma5/doser.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/75694357289.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/84883341619.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc90ea896d---54758166095.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/dowejolidisurozaretaki.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/kasesul.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161500bdb43553---lolularali.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xefutuk.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/gufisadutabulapoziso.pdfIn PDF document text
    • https://bloc-immo.com/images/riginawosid.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161492db27880b---80042273971.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/22515952195.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/9505111874.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/sukizulinolofopavib.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/75496132207.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/940cfc49858eae2630a0c9faaecf2665/xojetete.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/52928391618.pdfIn PDF document text
    • http://heizler.hu/files/file/50502428798.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/555a61120806298a9e379ccbd66d5e73/jiximatizutofex.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/97439076424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gitignore+android+studio+projectPDF 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_off0000b089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB089 10912 bytes
SHA-256: 02431d552e27f93df1d90e40dc81ec59454ccdc01f63dfd6f8d9ba5c0aa1d963
font_01_sfnt_off0000c9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 14224 bytes
SHA-256: a0272e221841d3c1bb6f6fd8d2b7b2df07494af2410bd707243aecc5af486fba

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