Malicious PDF — malware analysis report

Static analysis result for SHA-256 5feff5f485934db4…

MALICIOUS

PDF

117.0 KB Created: 2021-07-25 20:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a370534e418cb2907d6602c51ff1e25 SHA-1: 0a3fbaad89a146a15470f8506cd6d96906a357bb SHA-256: 5feff5f485934db4552333ea5664432f0b0f388c772d490fd836bc81643421a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF format and the nature of the URLs suggest potential for JavaScript exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://konstruktor33.ru/app/webroot/files/files/79497870026.pdf In PDF document text
    • http://deshdunya.com/blogimage/file/87078272895.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/zipaminenu.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/xinazolofagipuxof.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac582aa5ca6---geluwov.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/ligor.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/tu4an763pq10ged63ijmu5cvde/vosemesejus.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/dizolaxepap.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/20919192218.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/69675842488.pdfIn PDF document text
    • https://vestol.bg/files/file/44032557899.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/64164820621.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/339210b432f7e6c6ae83b840eb9cdf92/82958750572.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/sa7v7fo0p2if2jcsn3clgeeuh3/29497220337.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210624091107.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/053ba30abf17a858c2aa7d21c2aab84f/59696459845.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778c9c2a7aa---12961340688.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ffed28a81502f78d78edad2a81675794/mamomukufupiwufes.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/mv2mcd1sm7ik8hj6kuu3oagg16/pitanovudumeruko.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/xovuxe.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/68daee363708042642e73c8596559758/39640672088.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/488c02732468a407a2e3e099bbdbcc2f/27763097968.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2935db96de---genoxupuwus.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b758370220f0132cab8846ccec8be7f4/mexoma.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7c7lomlueaol9a316r25jgjup/35041625773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tipos+de+necesidades+educativas+especiales+segun+autoresPDF 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_off00016008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16008 10820 bytes
SHA-256: 9e8b5912b20390a63cc9261276666e54049c172c5923ea8760490350d9451441
font_01_sfnt_off000178f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F3 20088 bytes
SHA-256: b4f111cd9fa51c566e276f7b50f48604117a40782abcc68d83a50096496b3d45
font_02_sfnt_off0001aa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1