Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c18c3b0857d65fc…

MALICIOUS

PDF

105.1 KB Created: 2021-07-08 10:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f3ea9c6af762896265d49dd461af819d SHA-1: 7f18e784dfaa414dd457d39941a5238f974f59d2 SHA-256: 0c18c3b0857d65fc0b19cb3c65a68516ade99d06cc715cb7526da8a1926aecc9
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a machine learning classifier and ClamAV, with the latter detecting it as Pdf.Phishing.Trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/95023bb272c871d49cdcc80cedbfcdca/16504346300.pdf In PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/fagotagezaka.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/21450433299.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/41392678866.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/julimewivalibid.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091353c63335---pibejuxani.pdfIn PDF document text
    • http://topas.lt/userfiles/file/pofuduge.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/64266221456.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/35214256633.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/clm13h1tu9b9s2q14jb99upb35/97357502764.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d23d0a2f9---guwurulororu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c512261188debbbbe81cbd00c1b68a55/20827397796.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/23916371386.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/08017934d914ad1533b52b3bc92528b0/2740748240.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8c061d3a6848844a5f975cf084d5ad06/19494884996.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8dae68214cc3640faf633cfce201d3a5/nukozubexa.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021662138145569.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/40300261380.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/avkj51o8duhn4sj8q36r95qnvk/dapubov.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/dugavugelobagenad.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/nu8dvqd0b73vin686c9j1rnvkd/80729316563.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b295111f434---nufezivowuretabaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=one+direction+all+for+one+full+moviePDF 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_off00013676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13676 10660 bytes
SHA-256: 9f46a9d4985f76a9b8f35e6a2098bdfbd5b664ec8a5eb0d28b767e662f204970
font_01_sfnt_off00014ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F8 18600 bytes
SHA-256: da938fa68d73c584e2c5918d0699cfcf29a2c948c89ff4089a925a1ef4219c99

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