Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9dfce6ef208945…

MALICIOUS

PDF

103.8 KB Created: 2021-07-17 08:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7712f4a35bf8d8b66e1c1c3f11ecda31 SHA-1: dd5ea2455bd5b023173bc54b91aa99ad72dec999 SHA-256: 8b9dfce6ef208945ca9529adb626639a3ae3e24b06fdc7bf844ed1c84343af8d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lqk7h2sh9771go2k7mj93ue0p1/biwijekimenuwawetemudog.pdf In PDF document text
    • http://brandnewgoods.net/userfiles/file/tikasikukexuxinage.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/gadepasuwage.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/5ef809a037d5e83967b6efcf4cc79fd1/34926679331.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d1c4ad9e28fa55af916ae2e3df071fd7/bazenadezedapesutigadupe.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/95350480232.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/9b6cab0cbadbfcdf4c58ae30e41bae98/wupenofugifiludavofa.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/f19sih0tmsudiue2hu0g22ufa5/bupezasubelez.pdfIn PDF document text
    • http://prosquash.by/data/mizenevepora.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dssh7m9le8cufnk10n93u7qsrl/85206886054.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9563e9169---43553781818.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/82556193980.pdfIn PDF document text
    • http://africareview.in/userfiles/file/45543583445.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106120134492423.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e06d71af1fcca1fc4d7f8f7e1db43b76/39352586948.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4d3fe0933eb85af511903a3e625165cc/binapudop.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608101b004dd0---57411498887.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf95595599---lewipupelowumixedijel.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d64060596a---40895101218.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7959d347---56265951454.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/29925645782.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/8a150e83886ac370ac454e5f66aead8d/woxobazumeki.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5f5cfa2ecc35c04cb872d1f7c8b38b08/5829055228.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/vopenibogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=captain+marvel+first+moviePDF 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_off00013450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13450 17520 bytes
SHA-256: 5d8a391c00f1e4561f84cb961789ccb60e661bd525fd110945dc43abbbe70d67
font_01_sfnt_off00016164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001797b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1797B 10616 bytes
SHA-256: 10030523d311f2f21c3512be14701df3d00df7f9684f98ad124c975b2d9fff10

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