Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12a468d3d8c2ac8…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 21:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6087c51ab0c77899648c1d3ebb7adcf5 SHA-1: 2ebb8b9d567086be208738d2d1d938e3f127bda0 SHA-256: d12a468d3d8c2ac8b77fc4ab5f9937434f0ec790058243bf114aa15f3b6519a5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://superfishinglewood.com/uploads/files/kosezeredotub.pdf In PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/92728853530.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02d000e62---faxobuwefefogafaratulozu.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/bebutifiwamumuwivale.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/92358829762.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0f9f50f55---10538404662.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8556f637d60d8a48355e757c3c8a9cb1/38199080386.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/kagofamaduto.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/72857183146.pdfIn PDF document text
    • http://talesma.com/E/file/50921827060.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613057e02db3f---64995207454.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161474cf9de29b---jegejovoxixi.pdfIn PDF document text
    • http://gysanya.com/upload/file/21091802095519122610yrzh9uw5ww.pdfIn PDF document text
    • http://cecev.com/stockages/files/14600410229.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/10881613825.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/mikadaniwefobut.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/vuruzigafamolonekupaka.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/xotovoxuberejefisuved.pdfIn PDF document text
    • https://istanajp2.com/contents/files/35632999205.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/xudariwawa.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335cbb37d08---dexefatabixububu.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/39492847886.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/43907855825.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/jepizepodutabisadeg.pdfIn PDF document text
    • https://kokomanis.com/contents/files/34427931845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=wcc2+old+version+2016PDF 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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 10624 bytes
SHA-256: 451ef0f503a7eb5ce0f549bd0c53f0c75d7d579190062b3f05f8689eee7a7bad
font_01_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 18164 bytes
SHA-256: 649fea6b29404bd4ba4fa8368f762f9bb0f0ff72d12f22f79e6fe5e32c33a1ba
font_02_sfnt_off00012b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1