Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbe633f2dbebbe3…

MALICIOUS

PDF

76.4 KB Created: 2021-07-16 10:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05b6191e4530c8c6a1750d8e72cf15f6 SHA-1: 734e090f22e15f54c3d588db79248ca4e750c1d5 SHA-256: adbe633f2dbebbe35bb8aba5ef38bd1abd2b68ff2bff50ae76ba22973e1a277c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised or disposable domains. This suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://alibabashipping.com/userfiles/file/jutot.pdf In PDF document text
    • http://carlaschroyen.com/content_docs/gipufome.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/54740114302.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc75d6711d7---25327059012.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pr1qpg404aefl5q7gnomhidug6/35456008534.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/92054722033.pdfIn PDF document text
    • http://schokozentrale.de/idata/zuxosizuzarili.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b0e7dc1046592d82a533bb7f9c23eaa6/pezasak.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/rapimetitagegamokegim.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1518f5e064368efd276aca3327b60b12/55987684553.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/wepugegewevolulixil.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/70805925432.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc049ee265---5871321148.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/talibekipikatutimuk.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/690322caa05a9adc5f980a324cb684f3/benapadafixenofivomodi.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/17165190797.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/lezegefodaluzip.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/43027203620.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/485fbd1a43c05696e9247516001c5839/10722515585.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/cea37a01d93a1202894d1cafaafc6465/37131663616.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5211ba5f5---46229323482.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/zisebe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e20053c527---97904531587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+steps+of+a+righteous+man+are+ordered+by+godPDF 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_off0000c7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D1 16444 bytes
SHA-256: e367eaf2599695947659995b55febbeb7bd46902463cb4d8e1108c7d74a89f2f
font_01_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 11216 bytes
SHA-256: 216632f5f5052c0b02e30a4ae796826c68b64e797675db15dc426d886a637713

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