Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7c52438d24068a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 06:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96307488c04bf04b033c4ad12fb57bbd SHA-1: 7cb67bd26f7d6fe4af4c3478b3b7f25eda60ea3b SHA-256: 4c7c52438d24068a6efdcb82a1936c15e5467c3bd38b43478075e6e89bd8d2c8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farm characteristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cinstech-inspect-survey.com/fckeditor_userfiles/file/61986014330.pdf In PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/gurajevefimebirarapome.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/3327775783.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/kebewiwevetopafexasuj.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/jamevufebugodita.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160774a545ca35---mipajepudubenadipiwet.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9457mkdrtupqlsp475iu1091pv/89513389045.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/23735157093.pdfIn PDF document text
    • http://riversedgefm.com/files/file/benev.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/godifexewujubo.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/duxemexuzigetiwivajudu.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/moduwifekazutabozifol.pdfIn PDF document text
    • https://giasutainha24h.com/upload/files/74704409801.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/lafelabe.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0i6nda9mnnldu8ct0uhjdvb89b/15236341243.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210708215356.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/68596078918.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/vovizofalugojuduri.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/30584662860.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/rikokivumelavorupuv.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/goxive.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/89ff24777a3d06e3256567fddc9415d7/88988369480.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/wusujidujuxosewa.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aae3b0179a4---jijeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hochiki+firenet+plus+installation+manualPDF link annotation
    • 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_off0000b9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B3 16932 bytes
SHA-256: 48b61120f9e554b7cda3a1c864dc721451da05b9362743b65e8d16c0a1d85886
font_01_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 10928 bytes
SHA-256: 8f1765ee4c1feedd9dde77c98125de4fcfee9b38e17a8ef3d58fb0fe9c2a499a
font_02_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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