Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9e639072db6455…

MALICIOUS

PDF

96.0 KB Created: 2021-07-06 21:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c1b9e902fd9267f9d84b397eb424869f SHA-1: 63388476d365dd785bf55adb22c0ed7288bab0f6 SHA-256: fa9e639072db64558d87a359123aaa631ddc975250ffbe2177b5a70d6760af35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malware or host phishing content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://infrive.ru/uplcv?utm_term=clan+castle+in+coc PDF link annotation
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c509c078b8c---2558286420.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf6e77686---7306932216.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794538b50b7---24927367632.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/15390301937.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/a4301b7d1abdc284cc7da2cd5b3226f9/12554870243.pdfIn PDF document text
    • http://yilip.net/userData/board/file/jonojiwutonewekasupax.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0553766c90---58066264850.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb85a7d3b---54989540825.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/xofasixik.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/sakopomugipobirodux.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/xezegonemakexulaxedi.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/vepunizajiragotugajuruvo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/dobisovaduwolireweni.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/vafemipasa.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/98799027883.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c492a26e5f5---98419177404.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jdmfm6716348hau5g24ed6a355/4506263422.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/zupozemovikixazeduvi.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/17219077052.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/67buqv15hequlg3q763lcle48l/zopefidixoranofe.pdfIn PDF document text
    • https://digireg.org/upload/beniwe.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828001c181e---parokuvugew.pdfIn PDF document text
    • 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_off0001180d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13024 10156 bytes
SHA-256: af5c0e2e4e48ca724a8ba79a89863d2c2862cabff1f1a57a22cd6e9c20287b79
font_02_sfnt_off000146fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FD 16884 bytes
SHA-256: f6e66946cc20cb63a2ef34a1ac21a33d50e93657c04f0c5cb13d6b5083a0cd37

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