Malicious PDF — malware analysis report

Static analysis result for SHA-256 11be311332084a44…

MALICIOUS

PDF

93.8 KB Created: 2021-07-19 07:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 588d7b354cf851c94f6281eabac21b15 SHA-1: f73bbb4fe41b17756b6ae32496707a4d35773693 SHA-256: 11be311332084a4467bdea7e4e111a671cab483f475d25762b8e3d84f3a5a3d1
164 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of a link farm and the high ML score point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4f5a0d331c1ef8cb13c0707922e346b3/pulopelovezanapaguw.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c17d3130a---47787779129.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/76564034686.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc65e88be0---66678099737.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a445568d00f---73859492520.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/fuvokuropubebowawapuzog.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/timiz.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/57584643501.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073822551311---19316799455.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/73254262322.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/60743960196.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b457f3ae42b---58050979063.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/taniguruverur.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b8d783086f02f8dd93d61f222f8463aa/90899336024.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16091bbf685207---bavirexigamesepava.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929a1ba1293---79823491352.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8dede521b43444053f2dec1c7aff637d/96301611779.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/1525687301.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/be4d90b03827d67d933dfb1c3ada9c45/jovobagudorofejupinefuxol.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/bezexezikipamisisujapon.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/86ffcb065fd186a1a86e5026bffbf9fb/45627795062.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608736d3455bb---mimawajijujilexejuzedare.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/zudadepurarukefimozejowak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=can+i+get+pregnant+with+pre+ejaculationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 10832 bytes
SHA-256: 2a8736bc92da4b64b1f50087c0b4e9ede8ca974bd93f3c92863232b6a4450364
font_01_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 16396 bytes
SHA-256: 0d5ffd35431de3a46edebb3e7d04db42186100d4a60b404ad8ca180934dad6cb
font_02_sfnt_off00012059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12059 18280 bytes
SHA-256: 7905cba966f6d30b9a3b07cacb479d9bfd3ea417968bcdf8253860be7ac69783
font_03_sfnt_off0001510d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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