Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d254ea911a2c795…

MALICIOUS

PDF

93.2 KB Created: 2021-07-15 22:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2a5684f105593c044fceef2d3f0afc2a SHA-1: f1a8c289e964fa1cbd5b125ea8ff63192e47cd01 SHA-256: 4d254ea911a2c795686121c043dc13521c5c7ec93feddc9a4c358560dc7f32ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://seabeachthailand.com/UserFiles/file/44623176610.pdf In PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/3a5e5f4cc77f6ba51d0b9328165208ae/togipavew.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/jawiw.pdfIn PDF document text
    • https://chp-travel.ir/data/file/19268669260.pdfIn PDF document text
    • http://jsdarvin.com/files/kituwijevividusa.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ed2062674---43426240229.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6cd1543bf---30864863134.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/xajemabuluweb.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/34692345354.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c33a40c27ad---90151373827.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a848e3c2928---23041114392.pdfIn PDF document text
    • http://learningkey.org/userfiles/dexovedepe.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2689bf8e8929015f158df96c64adc72e/lomedakevomori.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4vea6u2dkktfqas7rbv5p9ngd6/73622773900.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/5dc6d8460c7eb0bf8f7f75141ace8f1b/xasepukusilesejuxuvutu.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/29317e4b25c2700de860f309b09683ec/xikutuzarenolodol.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/relurewafomefomojewoxawul.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/dututisawapoxudu.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16230340211175801486.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba912ce64e5---18903255982.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d4e471077c8d261b0617a83f96365e4e/31348686367.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/91169b1a75e730ea0d1936e61db92743/limusatugesipepugumawedet.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/vidanaruvemamenalorofu.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/wijofiduzijepej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=11+gmt+timePDF 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_off000108d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D5 18848 bytes
SHA-256: 882b6f1b65a149696b0c85207d6a1ca199e20c14aab3c12b157451b474966835
font_01_sfnt_off00013a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A67 9708 bytes
SHA-256: 34d874ba13be6a1fb4803f4d42dce955e27c467ec5fdad0c7dacb1057ddd3a73
font_02_sfnt_off00014f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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