Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bcf6ab48d84f0b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 16:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43b2788c496dcd61ed16e32daecf1898 SHA-1: 9324fca91c686ccd794ccb1f4e90b754a9a096c3 SHA-256: c2bcf6ab48d84f0b590c4f1c9c5337000bfd0eab6e6569bd29d5581de1d41ef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of a link to a compromised WordPress upload storage further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gldbirdgel.com/user_img/files/polumufirelikamed.pdf In PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/99239951031.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/51419803978.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/waxovufudagisu.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/28709909406.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/7577922134.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/fazajojewuk.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7dd5e4bed---wogevevuruxu.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bitegerasokoduk.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/73715968191.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/30828248834.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613082e2ce790---33494315959.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/50362995915.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab4694393---31889618619.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/gakinuwopo.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/72268374661.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/mizolasoke.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/xabipadu.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/97401892133.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/xugulurep.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/nomonivabesenakojotu.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/mimopebativaravazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=watch+dragon+ball+broly+onlinePDF 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_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 10728 bytes
SHA-256: 238448ff201cc9fe6547f2f98ad54808b0fe5db8a80c2e53914333ec30e58552
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 18132 bytes
SHA-256: 35505cfb43f327de1980aeb5f00ae3bfbc0658734b3043b9006a16fe28e837ca