Malicious PDF — malware analysis report

Static analysis result for SHA-256 233db993dee02d07…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 23:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3bbedeb9bbb4b1c61694d3f1f587f803 SHA-1: 543d39453d4779b944f74204f39b70afbc6fed64 SHA-256: 233db993dee02d077dff5e4a4fc823e5f9a9d157f3f3ead99f6322b552b45209
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://deryalvincotokurtarma.com/userfiles/file/gupufalusow.pdf In PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/78be6aa1d6fa02323269988d7f795273/62092990854.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/56124249643.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/giwugoko.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b4c2fd73fe6d1931cc5da99b6d1432e1/lozalebatu.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/wogaxatibijevugufuwidafev.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/logemonido.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/remumunabifijasijix.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/96978278274.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/63685719278.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16081cc0e41fd6---wolokijalupomudipiti.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202108290803311661.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/72978979400.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/97894391610.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e5a57cab7---43346238570.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/vuwadugeded.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/37494058754.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/revogopoja.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/sodugojezelex.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/fuwodasizixor.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/31175822136.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fe5baf7d2f2ad55b92bddb8dd0a15bc3/81362788198.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c72afef173a---35608343812.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/jenetupodor.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/96102542071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=image+to+pdf+converter+android+app+downloadPDF 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_off0000d229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD229 17592 bytes
SHA-256: 990582dac28e2354fe4dfe830f8bb84b7ef9d141e88e74ce9232e2351bcfd186
font_01_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 10896 bytes
SHA-256: e9546edabd35a3a1b76ffe1f329b6d8e3524799579661a7ae1d940a0b5cdef7b