Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95d4e662b770c99…

MALICIOUS

PDF

70.3 KB Created: 2021-09-01 08:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4ea8c9891393ae21a21fffa0da3eede8 SHA-1: 99968935f283463d96e12112ce3fa057e4f0fc1b SHA-256: f95d4e662b770c9990516c176070aebba54212fd902299fe5ab42741130ae709
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution attempt. The heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7692

Heuristics 5

  • 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
  • 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://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/xepujafakusad.pdf In PDF document text
    • http://asupuro.com/user_data/image//file/duguvemamasuzubewo.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/43149436369.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/pezobipakobevunatofes.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a83774d5a5a---gibemo.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/donuxipobiponuna.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/vodufomuwabexaxu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mn24s80v4ko10ro75t4me812mo/zemubavaweso.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/jaxijewusit.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/21846374744.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/11148312615.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3dc17865---zatifawojomofututagusuvix.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/lekixonigaxikiga.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/mulukodaki.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/53624279396.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/d7fa990e95cb2f0795a0f52fe40bf75f/38186397575.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/94700317666.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/d73900f45512fade20adbc85bd23d46f/86274888574.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b38a98ae9b0---22771217193.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160767a315eacd---zozelebodudipanima.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/kibibizusanoxidejit.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/78461192265.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5965c86482---vemufik.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/panonubadisujidupi.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/tifilogu.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/fegoronedozotukufaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=comma+special+characterPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 10564 bytes
SHA-256: a4338ca13dc0926377bc45307571c179b379352e736e4bb677d2bf805e233e0e