Malicious PDF — malware analysis report

Static analysis result for SHA-256 99827215e12aaafd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 14:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10a298c7e01cb0313e494a0f8fb1aa2a SHA-1: dbc97574b9c7b7925f34ec45c3d94cd452db52da SHA-256: 99827215e12aaafd57c4c6235307a4dda4be3dea1e1a2dae2dc0bf9f13aae8da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, pointing to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gamboeng.com/assets/ckfinder/userfiles/files/wogix.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b3a9bbeef---11635400714.pdfIn PDF document text
    • http://albachiara.info/userfiles/files/suvupuruzijuxexusade.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/mawuxatoxozel.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/50795365374.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/vikabas.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/rexabopelalibagamifut.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/disaxivukipobotefum.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/gazerodowuzulig.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/31855704609.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/rupasafowutadu.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/wubixibizukibewiguluzof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132229fb67e5---xozet.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16136436c0273e---gotapexelazozetonilotukip.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/36038790377.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/64237668836.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/93877385786.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/37241025904.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/24354186185.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210903013208.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210902_A64B72BCD7133719.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/derunon.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/sofejafupojasezarujojop.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210915215643525340091vkl.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=blockman+go+beta+download+apkPDF 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_off0000d46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 10868 bytes
SHA-256: 4df8b14184a98491bc53a8c2f001514f4fa1f3eb82fd1053d3af18aef5959fc6
font_02_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 20608 bytes
SHA-256: 795a3e0498d464963f8a4353899d4886ceb61fef4256a09281d59b91121aa033

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