Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c70ae960a9c617…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 06:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff381857c0c7a9233d2dac3f6cd9ad08 SHA-1: f21140fada3a69e207009ea28241008941fcb6c5 SHA-256: f1c70ae960a9c6178381e914106d6bfe20f14fc20dbb9d7a83dbee6c1dfd35dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

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 https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gb68j4vapknmfont6v35270e8a/20688380530.pdf In PDF document text
    • https://agatanorek.com/files/file/60163409824.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/270038409731.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ko8342f6evha67c10jf0795l05/21846658834.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/77579616038.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/99130225778.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/joxaputokejaz.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/xusebi.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/12742007732.pdfIn PDF document text
    • http://dzbnf.com/upload/file///lofinidirasasofega.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/35542702510.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/93439937942.pdfIn PDF document text
    • https://businesslife.com/content/file/36930914961.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/rimexilo.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/38554871202.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/daroporukiki.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8690e5f62d---83410563554.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/68fda6121ce2210b882875594892b7bc/80727842575.pdfIn PDF document text
    • https://0900107678.com/upload/file/35324691246.pdfIn PDF document text
    • https://brs.jo/userfiles/files/74909472689.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/juduzigak.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/risaramofakotisufufob.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4ac1955415c9d2c1856b274b8b07b68a/fotojesomopapevud.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/lipusiwaxiweno.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/71218333397.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/5082338229.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc92b07b3f---76122037961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=vishnu+sahasranamam+lyrics+in+tamil+with+meaning+pdfPDF 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_off0000b607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB607 18304 bytes
SHA-256: d99d4e2bfec507c8ddbb4163429d9c9277c554d5d19917c6ad6646f8ffa7c509
font_01_sfnt_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 11216 bytes
SHA-256: a54644cbedd8d7d4da06fa8e8ca6f5cb6f1c2dc22f904ffcfdc37282f4a4253c

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