Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ccf4e2fff363754…

MALICIOUS

PDF

95.9 KB Created: 2021-09-14 06:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7492090438f55aa0005a37c4dd9a49ca SHA-1: 8028f478bc9b7b402b57e634fb3e0063c59ad266 SHA-256: 7ccf4e2fff36375478095d6de2ab49747e2776affb248082438bf008a1ed9461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e39f757227---guguj.pdf In PDF document text
    • http://soundspace.eu/Upload/file/dakokekeliboletadefud.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/rodepepofedikix.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/voxasikebixepu.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/moteme.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f4ff5243f20608f95df96b93c3fa35d7/77332418601.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/gasejanaketedowapopevem.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/letikel.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/22716459821.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/dotefuvi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/edf61b01fa939be45cd46d672e92fdfb/85737430749.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/18evka5cpolfm72ro8sl6aeqnn/52710840676.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/79677969697.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161315ca71d242---pilekuboz.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe8d6d285---41986787567.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/89516848205.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/pezetivuwegurunu.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/nutojejirexowuneru.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65836679c---1659240530.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/181645177.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/iiaeo7lujsf5k5dashmlfgjs05/93871064986.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/dojoferuxopapepo.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/61684188291.pdfIn PDF document text
    • https://desco.scp.hr/files/xizufutujogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ad%26d+2nd+edition+players+handbook+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 9192 bytes
SHA-256: cec472d94eb3fdb0df358ebc6477a54accfbb063ec4a1f62a798cb8c4131dde5
font_01_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 24860 bytes
SHA-256: 400e7de43558aa9084d9fc1f00f6743d5b4e34bec87ba53975fbc8bfa538b75f
font_03_sfnt_off0001534b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1534B 16180 bytes
SHA-256: f47e898405724a55f9162645c09bf7b5f57d4fbacadf507f2ccf8b21268651be
font_04_sfnt_off000168fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168FC 1684 bytes
SHA-256: 9c928bf144e3eec6b0e52ae2bba533670589b2228405e28e178bb89e049a64b1