Malicious PDF — malware analysis report

Static analysis result for SHA-256 599a57efbf7b1125…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 07:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef43e3110e290df400ad6bef9056b868 SHA-1: 1ad2b8f5431c6120f77d4cdd102ec12431c7623b SHA-256: 599a57efbf7b11256674c54513966f0ec3c20c03c0d1c2727082528a1b26da52
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to redirect users to external, potentially harmful, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://thanhtindesign.vn/uploads/image/files/16585831022.pdf In PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6a0f6978d---87157980691.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/53104364975.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/sofefadel.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/60123210957.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/risanemudikavazoxofafune.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/betedamozem.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/78983873949.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/57362062536.pdfIn PDF document text
    • http://dejede.com/userfiles/file/78165199480.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/37795844306.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/46827614503.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/vevalajaluv.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9b37ae02c---sazepob.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/31424960263.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/vaniwederugir.pdfIn PDF document text
    • https://betsin.org/userfiles/files/megubesomunif.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/43389430148.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/60390623653.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-24/20210924154258196208.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2c59ec0fd10a5ce15d400c11fe0a80cb/2389026401.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/22785583658.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/50416911518.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/79149993865.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/5750035197.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/97498662621.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/zomiwetifilepifebiluj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=zombie+frontier+3+hackPDF 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_off0000b555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB555 16212 bytes
SHA-256: 3a7b77043b14d61ba9ef3e88c7605eb4356dbfe1af1cef7646d4ef33716cfe80
font_01_sfnt_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 10752 bytes
SHA-256: e76186fb9fc340ba3605716f6a307b3a4ec45a9f922b3611f4c7df03bb3a9740

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