Malicious PDF — malware analysis report

Static analysis result for SHA-256 158de381858ee7d5…

MALICIOUS

PDF

77.7 KB Created: 2021-07-21 18:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 298d64f79d1aa04b407bd3bb8dd2647d SHA-1: 4aff8c7bbfa1ae86cdd7182dc68aed19e093f394 SHA-256: 158de381858ee7d5a3e51074542e3c9dafd55bf7e5cd7fdc052f093307ca279a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as a distribution point for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14eaedff7d---digar.pdf In PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/nojutibelu.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/jawumu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b66f58d9104---92096425921.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/16545872548.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/17379263683.pdfIn PDF document text
    • https://nada70.org/userfiles/file/3500551376.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/99868724616.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe2b7c29f6---24406156566.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/kopoxekojozibuz.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad19c997c28---93542312026.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/vawidirekipalafopisakenu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608601717b0fe---guvotopenefuwilikunu.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/76007755755.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6d7b52498---86637342732.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609024e1f311c---bugarexaw.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/rexutigupiz.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/310b7433cece00f598a87a7c3e05adaf/mitimizoduke.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/441ff226d86f17c23e05df80ab34f356/51843682146.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/7202275651.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802cf2e751c---jexivozivodol.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/sowaxogejepitoruguzufizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=houses+for+sale+poppintreePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 17492 bytes
SHA-256: bc4ed538fc0ba9059cd6e5a3ecc772734c5a7db4f880f73c5344898247da6140
font_02_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 10440 bytes
SHA-256: 1e94fb97713d7923ab275adf7d52fcf0d78d346290e1c194f4e7e7a97c61be1a

Open this report in the interactive analyzer, or submit your own file for analysis.