Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad44281152b76f3…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 11:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4272b5e7437f6853550b932682136c1c SHA-1: 0f1b6db2b308d04f577edd8aef241fef1db85ae8 SHA-256: 1ad44281152b76f30762a6879852f6323b72e5b7f0d77e1f385071aff0075b0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JAVASCRIPT heuristic, which is a common technique for executing malicious code within documents. The numerous extracted URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to potentially malicious content. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=mod+apk+sniper+shot+3d PDF link annotation
    • http://77owship.netsociality.com/upload/files/32573687693.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/rukajorapixomesekodov.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2a69d4cc4---38465140655.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89065455372.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/27226342256.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/64970961897.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/zusamege.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/nevowenubolivoru.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/lamowapuxivobik.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/69021589070.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/c86n3ta7l4u2ph6db8d41rrs54/76050157724.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/52075984703.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e581b89a76---wugikixukeferarogejuw.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/47006048760.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/zufilosigazimi.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/95173041582.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16155b6b709bcf---lazulamomefofoxuvinabiv.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/fidixirewogegarimine.pdfIn PDF document text
    • https://cmr.ribi.bg/files/20915111492.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/50584499350.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/4e9dc3fe2d67914b557c7c871224f155/fefomumususijepebimigat.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614961c96a4da---8499427349.pdfIn PDF document text
    • http://stefani.cz/fck/file/82798839617.pdfIn PDF document text
    • http://mfcpavpos.ru/file/84793067222.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_off0000b43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 14756 bytes
SHA-256: 62941730bd231298b2da9533744728dd0ce2dd6550d3b638c34136e39b714eb1
font_02_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 10700 bytes
SHA-256: 43b18bcaa0394ae34b8efaed5d5b1244aa3af47852bd75cca7a9f34b40d5e4ed