Malicious PDF — malware analysis report

Static analysis result for SHA-256 808cb03fe2d45674…

MALICIOUS

PDF

113.1 KB Created: 2021-06-18 06:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f50e67f4dc20c79d40166e248892f8d6 SHA-1: 8fcd93e031dd8df604bb5c089dee65bba2529f69 SHA-256: 808cb03fe2d456742f1ea2576b14845a17f86cb2b2d5898b6302f298ed3ee71c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607378061592e---59416099415.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/0f91fb0b9eec75fe58d4d39b58fcd4bd/74064164622.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ce3f5524c2f1975bc858e69b3ab026b1/zederol.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb2fef2d6---depidojonizimomopexapolev.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/3d61453213d87aa63e2fd33117e18c19/66678057258.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa9ca2d3c3---felobitowuwo.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/nesimaduz.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f337617a---zifivugaviriwisubu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c6ea783b---65592033934.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/4hctgbco36k3ov49fr9ios2206/rudagijawotawomaxoz.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fadb56d4---84493820712.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/kuval.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5b11eb0c0ce09ab455bdb67d5ee52c61/sumujevenanujozexire.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/57647316657.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160716691e8677---30781567510.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/58323437231.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=haikyuu+season+4+episode+20+release+datePDF 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001431e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1431E 11328 bytes
SHA-256: ee4f846273f0f9e374ab283dc0c037dc403f47086b2ef497e627cb8f71c8f00e
font_00_sfnt_off0001238a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238A 3676 bytes
SHA-256: cccb12a5e40a895fb6349145aae08b3a05902d45c8a080ebd4c7d431aad1615c
font_01_sfnt_off00013088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 5440 bytes
SHA-256: 8294fee5ba1620c45415f4d441bddf293f2d1dff131db9fa03856097e7f34937
font_03_sfnt_off000162ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162FF 25016 bytes
SHA-256: 3551ca99c718a40b0fe31a6fa80e378771ca090bc30460547854802dd3473b36
font_04_sfnt_off00019d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D4B 16680 bytes
SHA-256: 6dd782ea3bdcc57fd1cdfa169ef387198699fe91a0cf9dd52a37e42d41b8b517

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