Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bbfff5c4a6d5fc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 19:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f676b1ada1408188b2d0ad7fe7a75f96 SHA-1: 76ac9110275b0999d2abf6e6e73551bdda2a0ea2 SHA-256: 41bbfff5c4a6d5fc6812003afab7d358d134e1bc1d04f15eeebdbab255f9c93d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=kang+digital+integrated+circuits+pdf PDF link annotation
    • http://z500.si/files/wuroxugudupurola.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109010203206386.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tdrjhc3c7698u6641bf5cngld5/jalurivus.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/krk9n70gev89gtikb9so8hcq7b/98316480222.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///21655749320.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/29/59712255103.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2270536d7---31223230022.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/gugab.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210803203422.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d3cc01231---34686570062.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e4138aba76---20741484085.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c51838b43b3d7f78be573b5af45cc40c/9529471499.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/l2ud4judh8v5sj0fbbchsukeg5/roxikasedo.pdfIn PDF document text
    • http://scpt.it/userfiles/files/fufiresonusaw.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/hqh1j5l52u4fjib55l8m3l4g13/lefawonuvaxunituwaboten.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/mexufu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tanisejajil.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/senopamivobupu.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/70243090112.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/goboze.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/5a46ef615f97b9deab72448a6a1f32eb/43432513023.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/56503309524.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202108082333288151.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0b02d85d6---25204139796.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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 10764 bytes
SHA-256: b82ac6bad181867a916e134f9c8d7315ff216be1064876eb6f5fb3bb2a5e2376
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 17280 bytes
SHA-256: a42b9d5473e76e001021a475039a14edaa0ac2e1330563b7f9f0b274798105f8
font_02_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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