Malicious PDF — malware analysis report

Static analysis result for SHA-256 3904855050b89cf9…

MALICIOUS

PDF

92.4 KB Created: 2021-06-29 00:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 73034893e13a3779dd0313a966cf9823 SHA-1: b9805de27e264b78e530bbf94872d982069188d3 SHA-256: 3904855050b89cf940aedff6d5c192e0ee2a97b750ecbb3b5d4eadb9256e1773
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/65c81d0765974def211927691d353f20/sakogixewunafawosojisugem.pdf In PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ef3424969---86986591883.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/dipuxawe.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/eda8f20781c4c5bb47ae9f198eae0059/13231767813.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/tubadikoribaxugafibabu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088620d40c6b---61105202717.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ii637o5i6bmj4df5jne8ok3o24/mixozalukufaz.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e9fb4eb06f9429057f5eb6938903371b/21216146365.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zebevolepitabofatideromil.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160747b1f33198---tugoxozefiwijaken.pdfIn PDF document text
    • https://webmenuplus.com/images/file/44534302988.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a09606caa924c41919e9be8f052257b2/zoganosiradenij.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ks3hm7d81hj7pbbi7667pp58b0/56618984470.pdfIn PDF document text
    • https://iword.de/userfiles/file/89366444700.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/mebal.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c564c4a3a7d---lukejebib.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872bcb7bcb1---9332039997.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/2aa61822c630242ba64c5eb16e0d9eda/tupoxit.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/misefido.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/jujoviro.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/b8nikkqjef31frc8ols1d9f2eb/50518888213.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/tegewe.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906ba1c80db---kitive.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608377ae921d4---ruzimapufaluxuwevuvonit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=harris+and+co+kensal+risePDF 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_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 10348 bytes
SHA-256: ebcaa095aa6665ecca19a1b4e5a33a0e7b4d8c163c093ebc561cbb439be3c09c
font_01_sfnt_off00011a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 18444 bytes
SHA-256: cabd78b2dd5eac4d6e901b1c02aa3c2886af2335c5a5d4759668f7f37f77637d
font_02_sfnt_off00014abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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