Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ac6ffcfb86b494…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 15:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7483985079dee4d8499c5c7a5a444fb SHA-1: 81b4f3c9c1df7c0d337ccd3e34d4f508bf3efa9e SHA-256: 22ac6ffcfb86b494763c85c29515886249d7a10cdf181eab34fbb9ef1ea3c942
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=kaizo+mario+bros+3+online PDF link annotation
    • https://matricula.netlandschool.cl/files/68434339989.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/zarizudukupumubitazowa.pdfIn PDF document text
    • http://kccmaul.com/files/files/koxufaxexixavonuvu.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/25037123083.pdfIn PDF document text
    • http://kotolantopeni.cz/file/57911168895.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/nujovumibivud.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/52979563564.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f20c58851---62716881420.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d26d28e98---53905285696.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/kapabor.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/d4ab6c22a29d79b0eccf7ab20620eda2/sorisexogajewikurowotova.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/6262425171.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/kuxunubatum.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/87086907657.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/xogajewexebaxim.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/46533360547.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614064764b8d3---zakevukujawusutabegero.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/55985850048.pdfIn PDF document text
    • https://people11people.com/uploads/File/54722745843.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/7577439474.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdddbf1e0b---12101265899.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/bcb5db15c8620442a27e47ebeab14805/46704199915.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/vewimagevejaxaxon.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_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 10532 bytes
SHA-256: 7f5040366b4b82242a75d99f387318a972f189bead7b7d06e632a51228e6692e
font_01_sfnt_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 18464 bytes
SHA-256: 5220e589a8ddad0a2e06c1676f70b1e67ce6fc848a63ef3a6f03fa3c311eb08b
font_02_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1