Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23d2cad45f8d28a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 09:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: f6371e36c5844b3fa0014eff4f86badd SHA-1: 15061427921ac0cf0c47828bc4cc7b6b3f22185a SHA-256: a23d2cad45f8d28aff6de2f3825a9d69d725ee658c273b8d3ca57bd6c97e868e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics fired, identifying it as a link farm hosted on compromised CMS uploads and disposable hosting, with many distinct hosts and UTM parameters. The embedded URLs likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6958

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://smidgel.ru/uplcv?utm_term=android+11+problems PDF link annotation
    • https://rzfmuhasebe.com/userfiles/file/gudokotemamo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394135c5be6---pogikofikibufewem.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/q1avvegd2ug5uf7p9qms5bp0sb/dogudanenozezake.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/takodufonozomumiroko.pdfIn PDF document text
    • https://fratellifurloni.it/file/wasonefizawomal.pdfIn PDF document text
    • http://pedraferro.com/files/files/zigatewaxitiboxud.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16140e978a9f9b---mopizerojumimobare.pdfIn PDF document text
    • http://asid.rw/userfiles/file/3466521532.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///40665122612.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/ragebuzijasojimekekibev.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210912171807258.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/10143590847.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614166b408073---43791625562.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/32810186881.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/85329165527.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/40462282471.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f425134be7---62179975551.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/xaridodebamerake.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/36255413187.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/taguk.pdfIn PDF document text
    • http://liyangah.com/Upload/file/fubupawipodulotonak.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vevapupuvatobiwe.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/dazeg.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/44775842856.pdfIn PDF document text
    • 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_off00012950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12950 18176 bytes
SHA-256: 89f20f4f2ee3d2e485ada5e8fde3151bdcb1ab426d6c6d3bc901bdde4d631f69

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