Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccf40f6390b3cd6…

MALICIOUS

PDF

86.0 KB Created: 2021-08-23 14:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36989e75f88c6ab56564ab990686201d SHA-1: e8ac1d6aaf9c687c88609a87ec543a0810fe74b6 SHA-256: fccf40f6390b3cd615a5afca9532ba3a87d399963581b65e66658afdef20ef33
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://desiaussies.com/ckeditor/uploads/files/makusodegubepozegu.pdf In PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/39977462571.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160928d2738380---xexofinenipi.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/30040000020.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5584b8e11---99831988623.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/xabigonogevajasumusupo.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/lapumopevuxisagubela.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/80950645451.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/gotapegin.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/savedekik.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/10968846911.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/giriwodimaxenagu.pdfIn PDF document text
    • http://sushi-belovo.ru/files/11113815946.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/2153298225.pdfIn PDF document text
    • http://sun-tes.ru/files/file/85157437513.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/34936449549.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202172419541690.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/511d5716ab8c216965e79864a851efeb/47869585207.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/tezofiw.pdfIn PDF document text
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/xasidurix.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/21651849340.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/82534907284.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/63438149307.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd69283a420---89758837435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=medication+related+osteonecrosis+of+the+jawPDF 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_off0000eb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 18016 bytes
SHA-256: 794ec52a77c1492dabfbdc6bd319293c8266c1196b7a5ab074152d6103bb4e34
font_02_sfnt_off000131ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EA 10784 bytes
SHA-256: 60225682633d58e030c0cd4df003098c7aa6fc6735fc0479db829cabcb3d68f3

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