Malicious PDF — malware analysis report

Static analysis result for SHA-256 970f3b44e7353116…

MALICIOUS

PDF

87.7 KB Created: 2021-09-03 05:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 165c724037d5f9ccf1401b0fe0930dd9 SHA-1: 6b3f444f639c2a8bcba55541c5394ba9a1aedb0b SHA-256: 970f3b44e7353116987a1ce97cf2659fc4cf258dca981652d6dd7a34fdf6e1af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it's part of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bethanybaptistcolumbus.org/clients/75549/File/17068277565.pdf In PDF document text
    • http://meadescafe.com/userfiles/file/tibinewebivudafoxowim.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/8fh7bkcsdunf8lmgn2451tae74/82148284040.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608511ea0814f---kafokimadub.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/fu5nt2helkvj43gfqm9g65dkqu/31073169388.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca058196640---vadeburojodadewono.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/7af2579dac49642a5259b898db6804ca/68686656277.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/43391807997.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/71309894096.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/87224819402.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/vibifozuwiliguvegidi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872c1f47be3---bejasarixoxor.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7595d4b437---satifiravenukun.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/69429627785.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/76778400416.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/tuseka.pdfIn PDF document text
    • http://charontrade.hu/data/file/gekimam.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/96673922417.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/tunal.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2be3c96e34---12592980785.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/bunujazitov.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/wufon.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/95732757219.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e93f5e226---xalivinupotigukevesawe.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/filesobokufurotapisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=laporan+pendahuluan+colic+renal+pdfPDF 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_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 10508 bytes
SHA-256: fad49dd7f7dd5c3d141cbaae20827472cdb88311b0f215d2a0b053b1d131d905
font_01_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 17536 bytes
SHA-256: 29a1e421459c9c5ef4fba273a64dd5dedd7d92384d90bcd126de0c140a69c4e9