Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f24be6778029ae…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 19:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb1e261318952f6e04aa253fc01b4412 SHA-1: 2f6d120c1c0ca1bf3350dea3f18f60f2a1fd404b SHA-256: d9f24be6778029ae4e9e2724f694db796b7c55a75ab9a326a04241bf5fb48420
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to phish or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://austral-immo.com/userfiles/files/8940990059.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021e74617d---71688591214.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/81605327522.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/kuwutivovivolibug.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/pebiputodi.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/16881863920.pdfIn PDF document text
    • https://arendic.cl/files/2217728155.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/57is3mgb0ejephg11ubsovnvde/pudifup.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/fefizufupanobotuve.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce6369b57---xutolesodiluteruw.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/nubifaze.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/93373505569.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/dizosuteroligubuxi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/st2v0eedd6f2p5r2eclpl74d8c/juwinobiponebivunepu.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/maxutagipaduvejuluna.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/difevirem.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/36242864558.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/22322287762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=samsung+galaxy+video+callingPDF 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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 10972 bytes
SHA-256: 1ec395a7e467b99e9ebdf36888de8464f13fd89c47724437ebdc0b6c55f9dc6c
font_02_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 18692 bytes
SHA-256: d04d9ae352bcbb4216e3d608e74d4b9a9c2ac9ed555a097482993cdf277f73d5

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