Malicious PDF — malware analysis report

Static analysis result for SHA-256 164046f7e36bf095…

MALICIOUS

PDF

93.5 KB Created: 2021-08-11 22:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f986487f9c557670437ad8d0a26052a SHA-1: 8d913c3e866d485e1f61dc1728660a9b7495342c SHA-256: 164046f7e36bf09535159012fd036f268629416404359131719be5256350b495
196 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, suggesting a link farm designed to host or redirect to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, which is often password-protected to evade initial security scans. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/93bgps8rpsl8dg1b9ng0i7rhh0/petunefaxulowowariwi.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e4c4cc2016db5432ea9ce52212d646a7/suboguwaleseloweti.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae938afabd70be548944b3394d316f37/95473301981.pdf
    • https://flyags.com/editorResources/file///83666889681.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aab20d763---98059587141.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/5ne9an7jk8178ln15i6dq3suj2/gejuwitox.pdf
    • https://adepotcustom.com/UploadFiles/file/20210604035003166.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/rusanibazozab.pdf
    • http://www.ecostroyservis.ru/File/pudavizig.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a3e86743---midijowosededazegumubig.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/jajunefaxedijeropalo.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb5a3a0953---guperemowako.pdf
    • http://szzxwx.com/Upload/Upload/file/20216201349481628.pdf
    • http://tonystelly.com/clients/873487/File/pelapumibebadovoxopej.pdf
    • http://www.look4job.gr/images/_user_na/file/21542647715.pdf
    • http://originalcheck.it/public/img_admin/file///8818415726.pdf
    • https://pmms-online.com/assets/file/20647125607.pdf
    • https://lesfeesdelhetre.fr/upload/files/54554554949.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7eed2b9abe---93811000089.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/lilevo.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160835e9e11841---namekadegewogadif.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab094689bf---tavuxivexeve.pdf
    • http://casaatlantida.com/userfiles/file///83393669827.pdf
    • https://benqmusicworkshop.com/fupload/file/fujoxi.pdf
    • http://studiofantino.it/userfiles/files/malawotunojur.pdf
    • http://amdind.com/userfiles/file/74802951581.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=juegos+de+completar+palabras+para+primer+grado
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f291.bin
649fa5dd34a8c4fabd2096e719a7e99648b011f22c43704dcada5b44b87f7c62
pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 18200 bytes
font_01_sfnt_off0001209c.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 16312 bytes
font_02_sfnt_off000136a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136A7 16792 bytes
font_03_sfnt_off00014ebe.bin
668753a2270bf914cbb6322faa6fcd784a4de596b1026d8e2f4b6c75a743217a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBE 10984 bytes