Malicious PDF — malware analysis report

Static analysis result for SHA-256 c043e6501856fdbf…

MALICIOUS

PDF

98.5 KB Created: 2021-07-14 10:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c52914e3170bcdcde44108f98f02dd36 SHA-1: ee50b1d32b524e54df1d5f220f4ac91df625e522 SHA-256: c043e6501856fdbfd2fe053e31b808afd90e79b059a2c04143b54e7ac7691bcc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick the user into clicking a link, likely for phishing or malware delivery. The presence of numerous links pointing to compromised WordPress sites and disposable hosting further supports this, as these are common tactics for distributing malicious content. No scripts were extracted, but the PDF structure itself likely contains malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1d00601630582422d240a316bdf0386e/85425020326.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/423ec380f077d193625c2429a02facad/jevenavima.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af69d057390---27000834070.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6568f7db35---20620899521.pdfIn PDF document text
    • https://medtek.vn/storage/file/tiririjolu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074fcd9b1b77---segijajekunuti.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lovanivoluxurupurumarawa.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa7f17a98---22717796214.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ugodr0pgk83j0ljo8r809r2hdr/josurusado.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1559ec1a9709814feda4812352ae6f2a/dazax.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3044b1a3e---suxovizoraz.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/43963890359.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a04352391e---torefoveteriroxawipe.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607246729b0c3---74216978286.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607778487610d---74134158121.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160778f0271e7c---88387409716.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/busirudabakozero.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160717c5914ca0---jizefifope.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-13/20210713223524838275.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42c906f82d---78262771383.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076ddc2ddc45---mizokikidudamujiximolafak.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/b0plruedmkdsq8m8m7vsco1hd3/denuzovekuvofu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8e124f30---98918419260.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/52722429466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sample+ach+letter+to+customersPDF 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_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 10616 bytes
SHA-256: 4e920111e4c397069e6ef83478558fb2f89151127a4531172b1fe25ae87ea8b3
font_01_sfnt_off00013355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13355 18528 bytes
SHA-256: f67c8dcdbc9d43c44c226d8ab6029f9e760098147539ef0d1568202f2b83c8bd
font_02_sfnt_off00016326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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