Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda97f4135818b03…

MALICIOUS

PDF

92.3 KB Created: 2021-09-15 14:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17be17332261f34e90b3a6bd04033415 SHA-1: 5f9ca4774402865cffc6ef1c6ac210249d6fd646 SHA-256: dda97f4135818b03f975a06f68ee03cab113b31a4a1585004060e4451be21389
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure and URL patterns point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://przystaneknida.pl/data/aktualnosci_imgs/file/40811389528.pdf In PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/61904566463.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/54970845773.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/82757461783.pdfIn PDF document text
    • https://kiptep.ru/file/jorafarota.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/31592674875.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/mekolurasoxiselan.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/94f3228fa0d1e1a0530bd155eb559f1a/58308408771.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0583994ac---4350087227.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/86289970298.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/68576508395.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/jitepabuxofafoludinewomo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc52a65f44---kiwuwejajuwozebalube.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132896ab1105---49101850628.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/kamidaziwapemi.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/21982891632.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/riwexuvaj.pdfIn PDF document text
    • http://kftchem.com/upload/files/59676464182.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/29078138632.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/hmup0ci6ahcg3rb44dhroc3a85/pudituw.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/bt738r0pond0530f3rb130d8ta/nozumonedogexiwamofuvep.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/niwataxutekolawobuj.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/36931218001.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee7e701f9---bitubaleripolun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=omegle+chat+alternative+sitesPDF 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_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10648 bytes
SHA-256: 0774c86e860c4b5008a10e382d0e76da82072ff44e5a07303972af286ba41b6e
font_01_sfnt_off00011d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 18044 bytes
SHA-256: 78d1b94372019379905114085dbd4a738ea58df108fc7a0280ed63e1c7dce586
font_02_sfnt_off00014b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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