Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63d4b0cb6f64898…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 11:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eba00a264da0630c2d2e0a20c760368d SHA-1: f74a1e2a62604da0178ed5d7fc315aa9faba31a4 SHA-256: b63d4b0cb6f648986aedd8b2541fefd65cef7443612e16efb1fe0db91c5ba91d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting it's designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's a lure document, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://naturallabs.de/userfiles/file/5890451136.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d44f0811a---55308992298.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/161057a46d15f1---gozop.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/76423048598.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061818262780554.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/vezevikudore.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/16839050656.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/jelisejoregokuruw.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/malelonolabejado.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/gagonazu.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/21254638560.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad40747ccd2---89032559445.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/oqhjca7arji376ita80bclfmj8/53786064970.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/tue085nd82mv22ttgbpmepe9e2/33946667496.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/fumoxoso.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/lejawovimotizofo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/89918be3f2280ee93afe4953306aa353/rumuxa.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/dki9k7ucjuoejr2t5jpoi9f893/5859296706.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/zumoxukijipi.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021061903535673499.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7b58d17df3814bbff9f4752653d1d45e/tutur.pdfIn PDF document text
    • http://licausi.it/userfiles/files/10416012539.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/matepabanupuv.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/99400589587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=iaea+additional+protocol+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012961.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12961 18792 bytes
SHA-256: 4a2faad13fab1f22fb6742e4ed7a334f73a3b39057fd87e090fdc428b085b547
font_00_sfnt_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 18252 bytes
SHA-256: a70cde8e3e1ca4ed4719f45a5bac85eaef44300f1383765fff40a7854e47e819
font_01_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 10396 bytes
SHA-256: 93de5db0c9c3516fff2466a4f906e35aa829f3fe8d4f3c4f20d62c4831a431e6

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