Malicious PDF — malware analysis report

Static analysis result for SHA-256 774fa0266288b682…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 21:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1148b4a3af78af2f41a1a4b69c318a0b SHA-1: 50142eb7ef92b7a5075e59ca58439a9e240bcc4e SHA-256: 774fa0266288b682eedaaef2938abdad8b98fc56e94f9163cf4eaea2f73a6b8d
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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 https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/9e57801cc7ce1d21eb83e5452c9118fe/xutabunofipup.pdf In PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/44014319207.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30537683175.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/12331724696.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/70889086261.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/24308303640.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16112eb56658a8---dedexo.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/53578779538.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/68182575235.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/54456989955.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/78659439834.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/88297078988.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c04d1999bac---782452070.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087190391325---metax.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/wamonosexetemasuduzugo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a02617c0d0a---muraraditavofinezasoj.pdfIn PDF document text
    • http://termocity.by/pics/files/beduzelojetuk.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/62156695266.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/xotivad.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/nejesudepobeleletaxawutu.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/40296128022.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/hv2k826setgmgao215pn2eobk5/janogevabixokatubex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=linux+operating+system+list+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 11116 bytes
SHA-256: 79e9420a878d7259a8f89589018fdc164225a847beeece9337779409660b3929

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