Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6bbbc7bf9f9167…

MALICIOUS

PDF

68.7 KB Created: 2021-10-04 07:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9aa91d4d7d8ba04f79af41423ade802c SHA-1: 3ced19041ed246e21acd488faa14ea2649e0113c SHA-256: ab6bbbc7bf9f9167ec09ee81caa77a209790057e905a2335e538aa43f589635c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fidelishospice.com/ckfinder/userfiles/files/94671423983.pdf In PDF document text
    • http://aaronandanthony.com/userfiles/files/52911173903.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2c65baa3e490a7538057b9d9cef6311/33688177218.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/vinukazufitokepufes.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/rawiranusubagusenetele.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/sanedazowama.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/26062935736.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/kovigixuvake.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/nudelupopogapotoz.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/zedejiko.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/78565164881.pdfIn PDF document text
    • http://pinxedien.net/upload/files/robowisomanisudidepegati.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614d086cf28e1---16850555893.pdfIn PDF document text
    • https://sealskinz.ru/files/file/66940471480.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wixivekedibinupazulu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443ae7e6cf6---jadonomugozinevororu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614118ed527e7---faxajiginapalemugegobok.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16151e80de07bb---poregijezifatixereforit.pdfIn PDF document text
    • http://scro.ru/pic/file/kemumilumiluxugazukofu.pdfIn PDF document text
    • http://insei.eu/userfiles/files/nulijevifojibig.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/bulesuw.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/remewivopokixumamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cool+places+to+visitPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/maxexawizewebit.pdfIn PDF document text
    • 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_off0000b01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01C 10260 bytes
SHA-256: d5a814a8a08da6af221df9d161b590edc8defbf94ecfed76ec17c934a64388f3
font_01_sfnt_off0000c762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 15232 bytes
SHA-256: e8d8f098a5014f134472d3378b0478b72651dc43f692b9dbd53d4159abb26a8f
font_02_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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