Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a4df27f47f6045…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 01:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa30f8b84132a7be873db0627cd26a66 SHA-1: e9ec7fe91dc31b8cd367a6d91c900eeae8b9cb5a SHA-256: 97a4df27f47f604590d989874b20d122cf8409fe2c4ce325bec85fcd26f2c043
176 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The document impersonates a cloud file-sharing service, a common lure for phishing attacks. While no scripts were directly extracted, the presence of numerous external links, many pointing to compromised or disposable hosting, suggests the PDF is designed to redirect users to malicious content or download further payloads. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://consulcongress.it/uploads/assets/file/koxinujesajavim.pdf
    • http://campingwithconvenience.com/files/files/59682178894.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/p9p05u7en6mi016cf7b2h8thq5/xubasenose.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336c22bcd5c---bepepujokanuxomumit.pdf
    • http://nyett.hk/uploads/news/files/6101740725.pdf
    • https://biocoils.com/img/file/fikeramekidozasafinig.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c8016421cde089c3acb0db34fb13f554/42716450010.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108a4d3dcc2d---gubikenumemi.pdf
    • http://zzfcw.com/file/fkimg/file/dipipumumasunaga.pdf
    • http://etre-belle.su/images/file/futoseza.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e27b2a83c9082a3b512933bfb616475/binuzumerilazepaguj.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/cf209377a4df8dcde8880839a2c26daf/resadam.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f9fbc3b1---22828839334.pdf
    • http://scottsdalehighbeavers1978.com/clients/80197/File/56573228532.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/cukf56ir6c4nddvp1q9bleo3r7/50926679671.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/253565d7c5b27aa7430bea791daf1031/71498080081.pdf
    • http://drironcat.com/images/file/88167561210.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071f98356db7---83065601370.pdf
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/bakividaforatufapavaboz.pdf
    • http://ilturismoinitalia.it/userfiles/files/30906720191.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b44f97b96---zezobowaditefadevijefovux.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/12333147080.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=converter+arquivo+digitalizado+em+pdf+para+word
    • 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_off0000dae4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 16792 bytes
font_01_sfnt_off0000f2fb.bin
2f6b75ef8530288d4e900966a080576bcdd7fae17cdc8294c2c326ead869fa4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 11160 bytes
font_02_sfnt_off00010c9f.bin
0b98a27932ba4c44e11dd763fc0c8632b2ce7f9cc462555a0c6c463eb17602e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 17568 bytes

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