Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b983ee413474e0…

MALICIOUS

PDF

68.4 KB Created: 2021-10-03 14:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e824aa8950cc900ff1ac07a7eea34b81 SHA-1: 6f82cc17080cb9f28339b57e0f15881edee184a6 SHA-256: 80b983ee413474e012783a8954a86202ca6e6eaf44faa5604434cb342123dfd6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide a clickable button. It contains a large number of external links, many pointing to compromised CMS upload directories, suggesting a link farm used to distribute malicious content or redirect to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pnvvr.ro/userfiles/file/51140974385.pdf In PDF document text
    • http://artikos.pl/userfiles/file/duture.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/63666312008.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/xometisivipemu.pdfIn PDF document text
    • https://motoralbini.it/files/file/48265578714.pdfIn PDF document text
    • http://teknis.it/userfiles/files/sabufusuxenifinudu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354dc5c7672---vilatumolokajiwexirapuger.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/96610924419.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f019d1e9d0---sirow.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/rurutagasezivodisolet.pdfIn PDF document text
    • https://netpage.info/userfiles/file/91459443900.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/xaxaditowagep.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2d185ed387f160e59f2d06a9bd50311c/86014079488.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/bubukiwatuso.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/10562729427.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/25075689456.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/eb2f8da7abedfe74656f8dcbb9217a8b/47908065422.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/83212046943.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/39209866069.pdfIn PDF document text
    • https://sitarasign.ir/data/file/91263741184.pdfIn PDF document text
    • http://wawa757.com/uploads/files/2743211254.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161587676a6749---20095861279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=all+foxy+fnaf+charactersPDF 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_off0000afcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 14308 bytes
SHA-256: 9c48c073bade6085254172b1e52ab636f2e257313e566f4a0966e9b2d2c5143b
font_02_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 10540 bytes
SHA-256: d73122c26ee8bb3f2d7bd15be16822cdbeb9d439b09b202f69c1e92fd3fb7071

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