Malicious PDF — malware analysis report

Static analysis result for SHA-256 de27b33b112b34bc…

MALICIOUS

PDF

92.0 KB Created: 2021-09-02 04:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6eac96c1fadb37d6990edea54623344 SHA-1: 11e8aa15b7fe1e8079a4592240204f9dae4d92c2 SHA-256: de27b33b112b34bc910f342721c1b9534e7bf86ad5fb29e0252f6d4d200582c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites used for file uploads, suggesting an attempt to host malicious content or redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f5f53ab7---85947037756.pdf In PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/fegotuwimifosireresizito.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/10f1e523be873382e5e2f0a0bccf6333/20105350481.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/v0mcdcvifghr2n1j0gfj1e96o6/mutiwegotitasevupilok.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160879e8b4b74d---73360358161.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/56c4772a1b49a69fcc3d81c87185f7f9/gozedugagojina.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/mixusexufege.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gogiritatovupe.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/54bb70ed131679883d9ae14b07d3b7d7/42713719636.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/kujamixoxujiji.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3hs81t0n153mnoa3d6cn0nnd4o/nufuxifurovuxuwawik.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611a11984bbfc---zopozorozasemakora.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec755a5ba1---xifepakegogedomufapuvak.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/25768483995.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/53b85ddeb178a97078b12f075130a9db/tuvil.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/42629499826.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/femirixaxije.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/xuwarepetejegag.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8d454102---migexupagimikomowogopomu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/805a3b4de995fcc47db9495a3919ef0b/18544503734.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/35336200223.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/75512991109.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ad7b4f389---dexukagopo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b5b4829d4626529b77467a9fbfd59b09/31955245716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=interactive+online+anger+management+gamesPDF 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_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 18072 bytes
SHA-256: a7e5ba6ae99065c4d0c0db4d9a8a22f6b1fb861e28076c00f350f19f190e8de3
font_01_sfnt_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 10592 bytes
SHA-256: 5c4df36037ccfce89ed7a081672f24463afef30f880164cb65539dba19f23897
font_02_sfnt_off00014a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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