Malicious PDF — malware analysis report

Static analysis result for SHA-256 16090c191fd5b951…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 12:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec8d9e78b675b60b320371ad6a52d31e SHA-1: a1c2d2f1f98e3e6c0f09a2a5e1f694e58418f540 SHA-256: 16090c191fd5b9519bb17d1df8d74f9581d8c748cc587579b9d32a4064823e58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://windowsplusllc.com/ckfinder/userfiles/files/18086752894.pdf In PDF document text
    • https://turasmobilya.com/img/editor/image/file/74131977376.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f43371ec3---modemotunezosufunejizowim.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/lirevetivajuja.pdfIn PDF document text
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/33630133055.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/862383433.pdfIn PDF document text
    • http://tyextractor.com/d/files/gugirutedo.pdfIn PDF document text
    • http://imoroz.by/upload/file/tudotemanevakabarilal.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109160916311014.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/dewawibal.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/91708827361.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/80553836700.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210909_110305.pdfIn PDF document text
    • https://mkart.it/uploads/file/kovoxasulad.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/35074709401.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/mikatogenopojawogekosuxo.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/todolopata.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/rubav.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409e25685a4---lijadavijagudifef.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d746728b8---getasuxupafejidefajuti.pdfIn PDF document text
    • http://ndt-ultratech.com/files/gutatazesoleviti.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/80140749812.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613501ea85853---77325768089.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/ditotopabadawaz.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/bijepirejosubifiwivumafus.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/kimabit.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/fomabez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=adatforgalom+sz%C3%A1ml%C3%A1l%C3%B3+androidPDF 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_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 17296 bytes
SHA-256: 00ee5566cf419478686d6b1b66ee47aef53cb3dcdc7673705274acd3bcf00d18
font_02_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 10924 bytes
SHA-256: 44021acfd946f4970924686c927b247a45f4b51ba978c18b50d95557d43104fa

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