Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d8ba33620b93ee…

MALICIOUS

PDF

90.0 KB Created: 2021-09-07 21:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9c8341890f3d9f7f4cd23e81ecf8473 SHA-1: a4e709b2e64ff77ccfdc01819bb2b7002609c18e SHA-256: b0d8ba33620b93ee141650b76cc4fb9fe8481520c4b9d55410f78b9c6295c4f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hyundaihungthinh.com/uploads/images/files/vaputurivanef.pdf In PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/jekavixoxanaxeku.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/nulaxixuwepozuwesifazejog.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c292a3d76---dukevufakizoranofuk.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d806e422de8---guwifodebevax.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/85199897930.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/55995527839.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/43971118243.pdfIn PDF document text
    • http://flomojapan.com/upload/files/17902387791.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30cd8e89c5---73384091665.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/81367139421.pdfIn PDF document text
    • http://consade.com/userfiles/file/nitadidoxexanuzuli.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/sikubegomifa.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/vurofupo.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/16951659959.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cdb938b0e7b5975b9a7499a707b82aea/56474965051.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/54702162589.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/67573948861.pdfIn PDF document text
    • https://datawire.gr/files/files/25336742390.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/15480514802.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/kezolofevumamifujomopi.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/84033469575.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/56346bbc91836ef3d8bc6b72576e7501/legagukosopaxebisolujex.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f33ee9d8227---fisodalumebojuvevopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=labconco+freeze+dryer+4.5+manualPDF 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_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 10928 bytes
SHA-256: 4b872254691bde918a94eab2ed111c9eeb72075110f14c19753a5e0f5e9fb68e
font_01_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 19324 bytes
SHA-256: 196940ad0fbed4b642ae8843fe2bf7063854b8cea8bcee3fa594b86391dfe62b

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