Malicious PDF — malware analysis report

Static analysis result for SHA-256 0037ffb0cdbc1c15…

MALICIOUS

PDF

90.4 KB Created: 2021-09-02 02:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08fd6e493fad827e6ac3a776ceaf018e SHA-1: 498839a55bd242286831eacb98c2d9a14ef3f374 SHA-256: 0037ffb0cdbc1c15465aebdbafd1784c7a951f41d86573d72dc4e44d3487ec43
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9dbc0d1317487c4577bfb599537c4a4b/93167327301.pdf In PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/gogudedesabitilekot.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b27a09fe3f---kibepetotebonifi.pdfIn PDF document text
    • http://huiking.cn/uploads/file/151021034448.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1cf6dfbad55c2f5ce9bb68b6e087a9ea/rebulolozabidoxigi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f9741dac308---70406744525.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/pizebadomemifekakeropuwu.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/38939842411.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/sivokug.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/galusaxuleforifononolumab.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/vakorivevinolerorejor.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/22974471685.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kagokabativipana.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/67664113889.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/zesolurukuzobis.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/kuvufesegixutinizofogi.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/13362496646.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/ledumenininem.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c65d60c1de782deddc36597160648ac7/91120925372.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5009a978961b2ca3b0ab05cc073d058/97581019825.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/30216408095.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/welejatopoxese.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9a5623e4f710b5fce5df4057a51c0ce4/gitidubapux.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe0e3006f6---wirizosemigaluxavosa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075225930e8f---8247998209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=1130+cst+to+pstPDF 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_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 9980 bytes
SHA-256: 53dcfc2d5b50ddeb91f968e265048beac18a55d5567849fc7b13ff36bcc772c5
font_01_sfnt_off00010b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 21716 bytes
SHA-256: 1de7a3283987347540ca9c11208bb56453f610fe7621a4f0d8c810e5bef2fc18
font_02_sfnt_off000142de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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