Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a4241dd1394176…

MALICIOUS

PDF

82.2 KB Created: 2021-08-18 17:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21f1c3c232ded8e7c6ac529bab22c7be SHA-1: dd815f2beb3239d8d97a5391e3db3a05203771ad SHA-256: f9a4241dd13941765e07d8beeca7781ab81e22e8bad73c2bba5f4e7819474292
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://alphamarino.kz/images/news/file/mezuxokopewafikudidi.pdf In PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be3e3e4149---40414343765.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7cb2478d2d7bce5e4ae974a3ae4baed7/zejol.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/dovuxivibi.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/zimaja.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83f57a0e46---92403944806.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/fumuduzodim.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/43d04aa915b22dc8d7edd2afe1dba7d2/gobofav.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/64043272030.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/51788959225.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021070714452273499.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/takofudozewosowubabosi.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/somulemuxusovugesipelolob.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/gizenumurid.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03242c2d3d---nakomudenesedatikobudu.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/sivigemo.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/mowogitapumebedase.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/41782867950.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/49f6e54782801238dbfff4c7d7847f22/vugofenoxujevorobiruz.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff1d55809f---45067859540.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/78222894909.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899b8791e0c---76282579227.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/74977560113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dibujos+plano+cartesiano+coordenadasPDF 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_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 10880 bytes
SHA-256: e6902f78dc795f920064f38831ad3628ae8c410cd947abf469f4b8ebea2b3e5d
font_01_sfnt_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 18000 bytes
SHA-256: 7d77231b8c79366fa1031d5ef7dcc14ef87e97e0c1b7dfc1e5ed3c47b6c3f1c5
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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