Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bf74497c577a17…

MALICIOUS

PDF

76.2 KB Created: 2021-07-23 04:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 445baacb2ad3d73387b96a1932591207 SHA-1: 70494e2d54c23511c608b3bcdbe96c0920175c3c SHA-256: b6bf74497c577a174b6b58d58a0e66383681824bda4361becedfa8f6eac928e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external resources, potentially for phishing or further malware delivery, rather than containing executable code directly within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6661

Heuristics 5

  • 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
  • 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://signika.pl/Upload/file/61792233914.pdf In PDF document text
    • http://osmed.cz/app/webroot/files/files/67722090026.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/62c4c7f0daed8e62e230708090adf8ce/juposotozubelivajuka.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/bifebojiwasovexipo.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/88707643956.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f99768d3b40---55882992241.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e04942905e1---28573567304.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/94779256198.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f8656696c81f08daa147fad2d02398ad/45358594987.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/lekodopurukigodereg.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160752860aa6d4---viminoguxisukipemobezuwem.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080098a9ca00---fikem.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ebvrbtj2bohqb80um0bsm2efmt/wakilufafatujogixibovu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d65cc2511---bizafugavanopuri.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/jaremupamowanexub.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/33364697004.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/xuwumisofunazinisaze.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/zivivutarakiji.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836b8e86429---kukatutosukijetiv.pdfIn PDF document text
    • https://dineflon.com//files/dalanudew.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/zuzojejoje.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062701043270554.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/31724608674.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/timejixinogubasadukared.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/mezofexadalowal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+long+for+nose+piercing+to+healPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 10836 bytes
SHA-256: 89f71d9999b634ca3188803b82d39077a47bbf29b732f14a7866f41fdb8da4f9