Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f6c792ba85a7d1…

MALICIOUS

PDF

90.2 KB Created: 2021-09-19 17:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6d0382a422fe1296c55218bc955bdd6 SHA-1: 9602c1f6f368c163d9e614cb70bf738c0507b81b SHA-256: c1f6c792ba85a7d10208171e1b415fb1070972d3b801805d1f6cf430071a1313
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is a common technique for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://wastran.ru/uplcv?utm_term=how+to+take+pictures+of+text+on+android PDF link annotation
    • http://transgusto.ch/userfiles/file/xidugo.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/levonubaf.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/judomuradexonitatop.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/77385441228.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3928a9a759e7a73c7066832229604a82/58880778775.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/nokamiko.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/19795368182.pdfIn PDF document text
    • http://ctm.it/userfiles/file/44301056999.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a427c4b18---31595316869.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67eb7fcb9---91626846142.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/37586668114.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/dcii25vocspdkk4j1sjc5k8ae0/39161469408.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qqg7i70dpjpmto30imsto3rrvm/kogijefajupasi.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/zalelagefemerewe.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4d45bd1b---minamat.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/ximabilegujegegowa.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/84171066954.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/4215433525.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/72809331179.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/29978727036.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/dujazomenunasojedanizuni.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/99244207505.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/somivunubovulojakebeva.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/35048549239.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/suxesuguxukamol.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/kexapekuw.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_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 18588 bytes
SHA-256: 374fc201d7ee5c4dec5d13ae60b4e9365794553010848b995a566897cbc8a18c
font_01_sfnt_off000128d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EA 10936 bytes
SHA-256: 1ec6c6f37b36c318f51c8d76ae6795bb06e99879fcb773b181b26c72c560691f

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