Malicious PDF — malware analysis report

Static analysis result for SHA-256 2995950ce6830373…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 02:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7e27206fdc1ea14a4b8ca294de4cbe0 SHA-1: 23c3f2ec8319e3b3dfbe6edf6f96c5354c63b2dd SHA-256: 2995950ce6830373ba84c8e268be548c3e8728b957f748bbaf8aa20d0a67a623
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute malicious payloads. Several heuristics indicate the document is part of a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute malware or phish for credentials. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161182499b50fb---11813728593.pdf In PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080446bf1b87---joguladu.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/kapefikipozo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c734452bdb1---wuzubu.pdfIn PDF document text
    • http://kalikraft.com/images/file/24423374624.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/04khl3j080c4k27vg94jif5upi/pakimedilozunisizipiwe.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1303e63a8c---51679748614.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/52123747229.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/vuremutipolo.pdfIn PDF document text
    • http://dothi.info/images/files/75835881891.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/2514308597.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609660d8aead5---zetup.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///50366716499.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/tabitubez.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609862f5724dc---96254080156.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16110fe76f27cf---vegilar.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/xudiwewuzu.pdfIn PDF document text
    • http://xsteelstock.com/d/files/noxibofenikofagosutig.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a0a9321b2d4662e68691fd41a73f828b/30035177175.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160852ea094535---37464946456.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/6984222770.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/xosizosavibibagenamu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d67f493bd---kawenomixilofajegewo.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/84859848365.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021071713065352.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116780a6ac3e---64473690518.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/57006160876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=definition+of+speaking+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_off0000c6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A9 16804 bytes
SHA-256: e07baea390c997246a79ceb35193799500f65b81079fba65be3c754796907328
font_01_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 10620 bytes
SHA-256: 2ed245eb4cfae24ec35a224cba4b341af1d8845c47763c1afda5886f22454321

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