Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbdb2277eaac900…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 05:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2fd9fa5d0c41b8725cfac7e1904a35d SHA-1: 1847ef074a4020d9a795f594c81e1e678719b7a6 SHA-256: 6bbdb2277eaac9004e4a870b3cede108da8161fe13f60fbb0e64a3e9452f6d9f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of the links and the overall detection suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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
  • 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://mrpressconsulting.com/UserFiles/file/94537663603.pdf In PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/kafex.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/bamoxevilezelufizolu.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/36626855005.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/welisinufo.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/medesetog.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/kuxifowedopopat.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/jejuk.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/tinumok.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-22/images/files/62713017534.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/pojuku.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/fuvudez.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/71090212081.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ufjgip8r5rmgc37e18oj7nafu7/wuzamunepajan.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065f42df57---fuberisemexite.pdfIn PDF document text
    • https://12shio3.com/contents/files/nijesifikirememunotepo.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/vumanatewago.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/10231578268.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/resagipadukoriwepib.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143636e991d1---pixugusazisitanobotas.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbe456f8c6---wupediganigikafobunujoxow.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/rewonosatasowazeguzi.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/16229821161.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331419d0e5a---jikivugo.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/mapabozorijesizimanajo.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/1817253995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=avatoon+online+freePDF 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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 10084 bytes
SHA-256: a39e4fb0ebce422b91fc57b43b30903f6a0e0d6cf3109b9af98cf006581bd45a
font_01_sfnt_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 17000 bytes
SHA-256: 4e3a5d53818c90b0c9e63d38c8e16b54eaa830d2bf7fadd9df3cf121f0cfd57b

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