Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9915b16a0fecaa…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 07:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c3c831b55dd35823c1686b9b7ada9f8 SHA-1: 793e76ae2979903d7d0dea9b5c11e10e4e658003 SHA-256: 9c9915b16a0fecaa2343cb148b21ea2919f20cb517facd8d9f8f80cbe4e87bcd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support the conclusion that this document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://quangcaowebsite.vn/uploads/files/50625237976.pdf In PDF document text
    • https://martas.vodrsport.cz/uploads/files/fipigajivugiravudafev.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/0v4qlo6c3k5l7dk99l09ntb7kg/79241087399.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/85486452485.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/23156079550.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/vobadu.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/pegivitifuf.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/717881432.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/kevegavutebadawukaro.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/74393126198.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/bipalarojev.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a534beab894830ea2a0b4d9432ce2a64/nelela.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/35006316531.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/4749209569.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/vafafisu.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/51701907551.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161403c29bf7e0---vefomip.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/xitidovujaxitipal.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/zoxojiwakalame.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/77191087910.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/niliwesikalokafujebuziv.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/54384823041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=maps+me+offline+free+downloadPDF 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_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 16832 bytes
SHA-256: 420b63bae5b508c7d584c722103e5f83c59dab7e67dc682e1d3fad4f7bd0ba3c
font_01_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 10640 bytes
SHA-256: 0374ac64cfa8d5b3bee816f4cf610d312680fb6234897e5400f96108f2900459
font_02_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1