Malicious PDF — malware analysis report

Static analysis result for SHA-256 18417d5bb431348e…

MALICIOUS

PDF

110.6 KB Created: 2021-09-11 21:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69478f7db8d909a54f07676d49ecc84b SHA-1: 94e22c7d581352359e6cd1bc206de3aca0a2b9d7 SHA-256: 18417d5bb431348ef80a0d83e9deb72551feac55b1ca41b9b7cbc20f410617b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. This suggests the document is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bbpcosmetics.com/admin/upFiles/2021-9/file/56879080639.pdf
    • http://kyea.org/imageuploads/fenapir.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e4a8f453---guradipuzosasideve.pdf
    • http://aaaexpressheating.com/userfiles/file/kanizadurobezorasotoxoru.pdf
    • http://word.mn/uploads/assets/94508959399.pdf
    • http://hatowo.com/app/webroot/uploads/files/rorizozabas.pdf
    • http://www.hgbehringer.de/img/files/files/piwemelokumeroketowesum.pdf
    • http://gocchame.vn/app/webroot/img/uploads/files/94145079230.pdf
    • http://ketnoikienthuc.com/upload/files/95915050154.pdf
    • http://chaukitchen.com/uploads/files/tavilovigurosutibola.pdf
    • https://promenade-perpignan.com/userfiles/file/wogof.pdf
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/46815732612.pdf
    • http://noahmission.org/dataroom/file/jevitu.pdf
    • http://antropolog.ru/userfiles/file/45049487994.pdf
    • http://kayapaliinsaat.net/file/jakituzuwesusan.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/semoxo.pdf
    • http://instit.ac/ckfinder/userfiles/files/15562875476.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8e542e87---74519434439.pdf
    • http://kelkenaghshband.com/app/webroot/img/files/xegafirenarop.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5c8a02518abb74f4d4e67a42021a369b/nonujawimomod.pdf
    • https://mumegram.com/userfiles/file/zevebipabidineguzalasel.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/6366440550.pdf
    • http://wonsakai.com/uploads/files/xofopesif.pdf
    • http://quatangsongvan.com/hinhanh_fckeditor/file/kivos.pdf
    • http://15881588.com/ckupload/files/nutibugewapemevigumi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+hack+someone+telegram+using+chrome
    • 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_off00014803.bin
bda9de1b10e72ae797c962c747afb566b7fdd15b74acb4cebd1f0f327210f53a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14803 19296 bytes
font_01_sfnt_off00017ad9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AD9 16792 bytes
font_02_sfnt_off000192f0.bin
8fc9304c98b42f3fc91b22086b846a4c26ce510acdbecb7ec4482b69f7e91094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x192F0 10944 bytes

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