Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad6071b889de89f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 22:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 083c76e92eb0505e019d22daca5f38da SHA-1: 2e0b1b84d8eb53816d33ca4befceb7a29ee0e7e8 SHA-256: 5ad6071b889de89f86d342c5a9297e6f588ae3bb86c1fe811f7294851eeab37c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to phishing sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://infrive.ru/uplcv?utm_term=dawn+pride+and+prejudice+piano+pdf PDF link annotation
    • https://franciscovalles.comtraining.cl/userfiles/files/83019532776.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912bb26b47---foredetetadudolam.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/9482130453.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/fisabulenabimivirekigamaw.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/daxojipadokimepe.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/dibunikig.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/sezubofoxus.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/44923239421.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/penodabexanibebevi.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/xemasivusumewuro.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/xalapijezubenaviro.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/vumuwapo.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/kavejexupesexin.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210903_FD29B068B32F9F0C.pdfIn PDF document text
    • https://tomaszbizon.pl/web/uploads/files/40955452715.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161319cc98500c---66061581469.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/dafibobasofejuvo.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/20424735730.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/82aba17d299b9ce8c0775edc308ca725/jokawobed.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/zetujirisiw.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/vupokobe.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/53314477154.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/59239420404.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/pegapozotil.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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 18456 bytes
SHA-256: 40f1c716fc54113bf8d4772244ea91e00d8a30a675ddfeeae41c4e40634c012f
font_01_sfnt_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 10620 bytes
SHA-256: 52dc0d78c1f280f398e93612cf4fd1f8ca40a0759ca9733db34338f426059734
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1