Malicious PDF — malware analysis report

Static analysis result for SHA-256 320bde4b03466dad…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 04:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c115bffd584c64c2b1793e51a4b7450 SHA-1: 519749c264729c676806af0e02656989b2db45f0 SHA-256: 320bde4b03466dad672f2973b2b159d614f3e956bd28ece51fb77ee5cd217f8e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to external resources, many hosted on compromised websites, suggesting a lure to download further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the use of link farms on potentially compromised infrastructure to distribute the payload.

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://hillsdalehorseboarding.com/ckfinder/userfiles/files/63422970448.pdf In PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/1194074107.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/1703679273.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/83230921340.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///24167614560.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rudigozu.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/zoluturolosixirerikaxosa.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/27624644619.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/zimupefujepobafune.pdfIn PDF document text
    • http://tochalco.com/uploads/files/tifukovowufazovuro.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16137568c37c72---84248712712.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/96237171231.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109082047283755.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7c3266ed8---60492278167.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/gixujupuz.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/miwubuvewe.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ee703cdd01e4c76ce7b910f2db5e130c/dutijonixusowevumesotuzik.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/kujuvesonunakofuzumel.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/firawa.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/37122200942.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/47644797471.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/11402641336.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/bizikir.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/66272224132.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/67344178969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+update+package+for+androidPDF 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_off0000bd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5E 16740 bytes
SHA-256: a3b766b58932d9e72ab9d8dbfc40ba37194a3284d5fd9c2e8d5d776103b493c5
font_01_sfnt_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 10904 bytes
SHA-256: da7d0834f4c4354a626b94f5407681e7792cc78bd8b4e791bab9092680024ba4