Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a5aa1fc8ecdf07…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 01:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9b65b1f1cd613b29c1d3e9361945325 SHA-1: ad7ec0d45b782b00b22b043c4af945ec78d8de9c SHA-256: 53a5aa1fc8ecdf07587d8661e83dffb83ec07c246f7a66a8b7510b69cc600ce0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to manipulate search engine results or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607db05047781---24364189628.pdf In PDF document text
    • http://bearings-home.com/userfiles/file/zetesawoteximewita.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/debekefogabinetazev.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/eb050acc1ccf4d499fa427dc1f50e857/fumenoxibatusumozir.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/pexulefogifoliwupovujilo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160953bf798900---92884589420.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/rufazeda.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714752a2412---80187776837.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/29627994798.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/23850586637.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc72d89ce---duzobazawivupufasupu.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/77678117805.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f36fba5b85---xuzat.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/sijubosawewokukafobexiru.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090fbe535da4---votafuximola.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/89055935488.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af8e7f86e---kikepopotanebafuvorodezik.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/63279598574.pdfIn PDF document text
    • https://ottopianos.nl/files/12478414453.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa63a7792e1---zexowozubipanimi.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/83741101587.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/s06n1stm48phntjb12qnq9j5dq/sexupipos.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/gizuludixeva.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/7iu3b7guvntc42pitua13399vs/64168041940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=clinical+features+of+dysenteryPDF 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_off0000c6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AD 17256 bytes
SHA-256: a83cb8ffeb2d0645ea04b30ab3f71823e6b6a92dde95ceae84b51dc37393db0d
font_01_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 10712 bytes
SHA-256: 4a5524c8ebaa32331ab4ce46c497acdeb86d719403166fc584680a7219814526
font_02_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1