Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e8d4b24f24f46d…

MALICIOUS

PDF

85.8 KB Created: 2021-08-11 20:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4febb44a45229503bdd70728dd183aa8 SHA-1: 25b6e2f911be9b2d72d9ded71206c3a07f21bd27 SHA-256: d4e8d4b24f24f46d642cfb609afa5ae0faa4c09fbed23a2ff73de88251419ab0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that act as a link farm, directing users to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these redirects. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f277612064---naweladu.pdf In PDF document text
    • http://3sdent.com/upload/files/madinodikinomegipum.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/90628c3d353d7648ad0a3e96792eb6f8/97518245541.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/rifulik.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160e8130c1e618---47712488625.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/57c4843d22c59ebb3929a9de00a897ea/gazimojekenulunefazikeluj.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/17156611510.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/kinusozifakivanuti.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/51209283998.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/92628154323.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/75073498284.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720af29ffca---bawesonuse.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a6ef34d73---mebexifemex.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/510099b6293f91dd85860ac3a8fc5e63/56784145936.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/2271083378.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c878eb918cf40f8a93243da072402ed9/35271221770.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b0b7f8bdfbb4bd33c93194c8e2bf4fed/zemasudusexavuwuseb.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/afg1uj95977pqotn3kf92d3em3/13079338561.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d1a57bd00---nanenijinofumozakegisugo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b048ea08b---96443331774.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7e143830---metofedaliwi.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2a6dbf418c3c819d9e303d00b9793676/jerosinefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=destination+imagination+challenges+2020+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/bolap.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_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 11212 bytes
SHA-256: c28a717a8e764a0a04cbdd9b0ab955aad0eb0cbc2841c92224a69b23fd852912
font_01_sfnt_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 17036 bytes
SHA-256: 8a32eb0d8ec13814bdebef08acb82a67b47223ce68f9efb49cc618c0177e7b19
font_02_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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