Malicious PDF — malware analysis report

Static analysis result for SHA-256 118c81b979138172…

MALICIOUS

PDF

89.1 KB Created: 2021-09-01 11:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aaf23c8a21e4c008096cdcc8a3264913 SHA-1: 4765907f594b8850655e0d35b9a535a92b8f4ea8 SHA-256: 118c81b9791381729f051f55d6610aaf8e586c4cc1367f1aa64d4a82f3888413
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://stavclearing.ru/upload/files/43771046578.pdf In PDF document text
    • https://anmimar.com/royal/userfiles/file/35221932600.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/2111807746.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/wuladevevorutalukota.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cf0a6d57f---dobimotuwulunasawunawu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/1d8c715095325ceb67746441174666d9/pinonewofux.pdfIn PDF document text
    • https://unosms.us/userfiles/file/6728256179.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050714153668.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/53087720492ea003b08fe27f03313b26/xisizirarane.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b560cc32ad5---memepubesuvibupigu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/fcsejsm2d4d6ah3ndl5p996hk2/kagedufe.pdfIn PDF document text
    • https://coatielectronica.com/files/nitogeluxugelu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3f4b13faf5a99589f1caebe3f8579bf1/rebugitomigipinor.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f5bb982e2---45347966685.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e1e421b2---82077653156.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/20614786250.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/79304103023.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12c87e1a4---12457430427.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/podudemiwebil.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd6509391---desatusinam.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8283e8d83dcc12a2bf9bb25387207e68/37898821626.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/rerapuz.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842715d9123---dunokerewok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=machine+learning+for+absolute+beginners+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_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 11132 bytes
SHA-256: 416814271d6cd1307fc40b676f7ca42c1010aabff89023dbdea2e42d294e91d3
font_01_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 17860 bytes
SHA-256: ae9db4d5d171e1369d8e5e16dbac6624464baf96ee5694d5f60660f020b2bf78
font_02_sfnt_off00013e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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