Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5231e38985a438…

MALICIOUS

PDF

76.2 KB Created: 2021-09-24 08:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 31a2178ce034558939dc816e42725ad5 SHA-1: edbb3a51cf737602c3fa619ef37314e35d14e664 SHA-256: 5d5231e38985a438b4e02dff5a366e8e10806501e92511fca20451744aab2980
154 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The document body is unreadable, but the presence of numerous unknown URLs strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8437

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f20ab7092---47222718575.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff42851468---muxizenitufosefobutimer.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/mutapubosafafujofebodag.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/rofipileguke.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/wuximajis.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/480383493214ea07d02d271825f2c102/6449713779.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/xikufonofexoz.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/57989162044.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/vujipujo.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/siruvefufoj.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/91570458266.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/dijoxutunaxujoboke.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/tegovamadixenimefato.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/vibafudulalu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3180a396a4c71dfea733e36398e99d5f/rusexupamilape.pdfIn PDF document text
    • https://gdaniec.com/upload/files/69184876312.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/gagisadifo.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/judaruxilexat.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/36921337024.pdfIn PDF document text
    • http://lawngo.net/fckfiles/9014812181.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/74897871805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tap+drill+chart+imperialPDF 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_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 19240 bytes
SHA-256: d267d9884f654af918f2766f834b3a8ddcfb717683da4bd5a3107edf40f6606b

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