Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c47748317f63215…

MALICIOUS

PDF

73.2 KB Created: 2021-09-21 12:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1949225070a2128bf32d70adc5d45f94 SHA-1: 47c239feb9eafe26cef0ee02735f38b9ac32e698 SHA-256: 8c47748317f6321586256ea212753da6c79d88d9ca2b95f26137ef9b8a4bea86
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The ML classifier also strongly suggests malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or SEO-based malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://musthighschool.mn/ckfinder/userfiles/files/gaduzufaxiweburipelu.pdf In PDF document text
    • http://websurin.net/UserFiles/File/14338078233.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/80715899145.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144041b4d00c---tidinemonunu.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/binijijuwimezasupixixoso.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/42953384387.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135530e440e9---81547349792.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/diwipizinemugaxomit.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/54384407067.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/582d936a776e03f9a94433cf48ff8ea2/kuvapozozuk.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/mideroxe.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/16545693927.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/dajutexufifov.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109200312332207.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/wozafisimubo.pdfIn PDF document text
    • https://ghnservizi.com/file/1137293302.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6baed1812---fipuga.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/30797189712.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210918110949.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109172147109651.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/73666093117.pdfIn PDF document text
    • http://www.andreapondika.cz/file/dudomibisaje.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/90120127174.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b783d5b724b0612572c6629ed9c4fd96/65544225130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=jerome+bruner+scaffoldingPDF 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_off0000b99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99F 17080 bytes
SHA-256: 944f1bf521e1bee0ece761e0a5805a2c43c0e1f41add2b79a0cb97abe88960e0
font_01_sfnt_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 10952 bytes
SHA-256: 06dd6ce4d84c04179d112869f844b0299c87ceb37adb337057462fae15e2fedc
font_02_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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