Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c8a7ea9dfb5295…

MALICIOUS

PDF

62.3 KB Created: 2021-08-16 16:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d2d82b72c804d7a7b06c136afe2898f SHA-1: 23242d170cce29c1adfc88105f4a7581429e7195 SHA-256: 88c8a7ea9dfb5295fcdabb22608f0cca07327b564d9dc5c3e7dd74805615f4d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. Although no executable scripts were directly extracted, the structure and URL patterns are indicative of a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7972

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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b571908b8bf---nuxid.pdf In PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/pejuvateretowuriwaro.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/e24i9c8arl9ov11ek27rrred27/71535530893.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16111f581b57ef---99127123313.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c642a84b6---95215404483.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/mowozotebasopokifake.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/121d8e4ca01a4f39dd285f10af174d96/6567752967.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160de41aff2047---dovogafoli.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d24e6bc2078---dovazesumedidol.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d95a498eaa48c8f4cac5ce7e598cfa41/26764564303.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/76cb38875c54fd69e54652841c6c837d/76984681409.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7e685804fec4fd1a897674b831312eae/vovuwijenonoraj.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/kodujosepenizewexe.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/jonevesubelovete.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/69678412106.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/78305471722.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/bukupepakoxuxitojinel.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210623034747_1zg1r2.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/poduvobesiwurovem.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/dc5e4a86bb2658cfdcda8941e8cbc137/49037932900.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/73952085829.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d6d8da5c---pajexajokemevub.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/99860999635.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a616b5542cd---tipogizidisutose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=netter+anatomi+atlas%C4%B1+pdf+indirPDF 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_off0000c3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BC 10680 bytes
SHA-256: 2254f0577dda6983e4b09bcbd98ebfeca79a436e11c9aa035d342af7331f2ef1
font_01_sfnt_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1