Malicious PDF — malware analysis report

Static analysis result for SHA-256 955783dc966216f6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 21:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 82d1984834aa89c9d3ae51b3431c36b5 SHA-1: ac7a99185c3ece77b48b7e610fb3bfdf2b0bd4d5 SHA-256: 955783dc966216f62d164198e67b5262dafda5f70bc09fbef089a7457cd01a95
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDFs hosted on compromised websites. Heuristics indicate a link farm structure and the presence of compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/60259ec1519f32cdda7bad47927e67b3/nemutisetizosubun.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ba1f209bf---89480445636.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kodivagatugawuvofexuxur.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bcca9459b93---37553577355.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/21129900604.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/8509299612c58ca5d65b.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///gekiteribu.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/97391308903.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5435f10367f74e9b50216c91d5e05d24/fofibokogedumobat.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/bc0n7b66nlkohrg11og1d2n48e/36765600442.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/246694701eb1b3cb945bb65095155f01/35644242645.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/83458346950.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/murejejumeguput.pdfIn PDF document text
    • https://red-adlay.com/upload/files/xezabakakeju.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9520a56a07---12982992974.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/41697798442.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/589ef732a4497ea561779d384cce3c08/gitegugikaba.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/91497978860.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/5ffc2mlk5g67j2gp39p3k0k3l6/wakotofedelud.pdfIn PDF document text
    • http://brlairport.com/images/file/14173698823.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcf0d0ebc0---kuzumumadaxotanufa.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6a586310ee296fc942950715b0ed7a97/jajarelewowubifogoxoxif.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/jogegima.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/velamixifovabugedop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+use+green+screen+effect+on+imoviePDF 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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 17264 bytes
SHA-256: f1b912b00400438c81e42daa4f7bb6ccf9851c301abe5633212d904ff68361dd
font_01_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 10712 bytes
SHA-256: 8b8dd3f30e2d3f1aaeee98f422a7187baf37a4c1fa8cdc7adea91717f494754f
font_02_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1