Malicious PDF — malware analysis report

Static analysis result for SHA-256 27da83281d3c0582…

MALICIOUS

PDF

93.8 KB Created: 2021-09-01 11:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b3511ae8a329a2ea9c17f4dd1a1f209 SHA-1: 7bf4b34ecef6210e9002e5a895d47d10bfc069cf SHA-256: 27da83281d3c0582173f006a746bdaefae0c6da52fa576a4c688d036b2f5bff6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609744601abe5---22107615837.pdf In PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eda3d9d36---povodazedakezalasa.pdfIn PDF document text
    • http://hydrem.ru/images/file/19824260363.pdfIn PDF document text
    • http://cpils.com/userfiles/file/sazebavovuguv.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/87883556134.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/60602809839.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/2900972346.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/99bb608e64846a6014c7996827e7efbd/vusilijov.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/c2hbll6k5h3u73gn3798rl97b5/ruxasenewivavane.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/vazujaz.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7934549698.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/50qtm23niqkfhfqfffk7st8fkg/34537670863.pdfIn PDF document text
    • http://strihaci.cz/userfiles/file/nutegogexamusejatodat.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b361d26ba---31395704820.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727bfbc6af5---33813256806.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/fajogizibezofagux.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed58010b7---80570769336.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7e3e1293526cc088dcf0aa5fe1e9b2de/tawavunoditoxojenuzumidi.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/766df45517f8bc965f33a7feabf2e2a6/xovegivokudedoguto.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612047d59ad74---wajovudizusoligatalejivi.pdfIn PDF document text
    • http://4darchitecture.org/img/all/9404755033.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e8006c89---zumukaxekozijezowujix.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/bewava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=detroit+fish+house+steak+and+oyster+barPDF 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_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 18924 bytes
SHA-256: 1c5544e8fb39b2575a622293d2dc6d5f3e6965bd394cefc5482ef2b4fca450d7
font_01_sfnt_off00013758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13758 10852 bytes
SHA-256: 4b6caabd2c403a69955a7c904869df7844e1947409bc8836217aaac4caef4131
font_02_sfnt_off0001506c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1