Malicious PDF — malware analysis report

Static analysis result for SHA-256 768c65e354c2d38e…

MALICIOUS

PDF

94.8 KB Created: 2021-09-11 11:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d81836ca74b8ef2b2735907684c48676 SHA-1: 3595029b3c2fc66c18282c732b9ed8fa540e9ef2 SHA-256: 768c65e354c2d38e5f19eaf744ebe79a518b2ad5911a7d2e790544b1c5419e77
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gowowdeli.com/uploads/files/62331090040.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/xobedasimunimena.pdf
    • http://standdominica.org/files/files/90130263765.pdf
    • http://immobilieninvestors.com/userfiles/file/30568922759.pdf
    • http://e-hematologica.com/users/file/riloxeralabuv.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613423c29fbd3---popujizuj.pdf
    • http://sarkanyhajo.hu/files/file/26583456551.pdf
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/rejebubofewekulimajebagu.pdf
    • https://thaiahpa.com/flash/files/96223576870.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a47da87a---xakadenugu.pdf
    • https://sharmtocairo.com/userfiles/files/51975466113.pdf
    • https://sua.vn/uploads/userfiles/file/15581015804.pdf
    • https://houstoncoinshow.org/FCKeditor/file/kolelivojusi.pdf
    • https://digireg.es/upload/19617819401.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161349e1eaa62b---79439601314.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/29634101430.pdf
    • https://ymy-tea.tw/upload/files/91201362119.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161332210e8056---tululutanivexikodi.pdf
    • http://nusratali.com/userfiles/files/bojulatesa.pdf
    • http://bluecars.pl/userfiles/file/letezavelu.pdf
    • http://studioindelicato.com/userfiles/files/zejukofebovile.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=drishyam+2+tamil
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a28.bin
1977f28f254dba78d63ff8c2fe5420386772876b27e20fab609b165fd1af570d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 10252 bytes
font_01_sfnt_off00012142.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 16792 bytes
font_02_sfnt_off00013954.bin
16c72c21015ab0bdc706a2af205768c3ac5543ef2ca23fbab0a22bb0babe4c61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13954 20048 bytes

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