Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebb45e912a0520b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-16 23:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 787192e9f0157b8910a27011121b0a34 SHA-1: f779f0af46c6f505fd2151adfa9b9f7400ff860d SHA-256: 7ebb45e912a0520b5b6dc82743fc0f99ae0ded0749fcdda5c0c86a711e2ef2e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://manpukulivermore.com/uploads/files/ribipavugezuluboj.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161427af8d44e2---bumipevotukivarudelane.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/36197992590.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/kokigemilema.pdfIn PDF document text
    • http://indemo.pl/Image/files/97764968990.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/venalo.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/tepolexinizobe.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/95290185729.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/49127046302.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/jurid.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/816d0daf9b789e3a50898d09f664d9ff/konaviwogutujewopofilese.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/153b7bf5dd7194a4ad0e5f313b97874f/24972894399.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109151714031883.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/16639311287.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/wofikobexu.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/57394084874.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/zudamewujazomupow.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/guzafevezenesu.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/zazukuzejedomulibavejexaj.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/rabezaboraxarorifawofo.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/3980955426.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/83263303470.pdfIn PDF document text
    • http://vodnik48.ru/content/file/woxoj.pdfIn PDF document text
    • http://innersolutions-uk.com/file/defigonafetezeledepomi.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/fubavejugafon.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3392d4d35---75433744437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=superstats+for+android+apk+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_off0000b0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E7 10844 bytes
SHA-256: 9671b1c58c1b4bf6d0ffd905fb2fa9ea763110626636651f12234f153cdb5b38
font_02_sfnt_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 14204 bytes
SHA-256: f6567c702e66b65ff85bc8fece25840eca1aa7043cb4e17dd4e579b66e8e28e2

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