Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba45f998d07c331…

MALICIOUS

PDF

75.9 KB Created: 2021-09-11 08:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f533187fa38b814eb39ffd789ba6a5b5 SHA-1: c59d9a24bbe7bfceae803f7564b34d0ab3a8d7a5 SHA-256: fba45f998d07c331a8ca8b57d482064825fc60e26caff6a2064adf83e32a3fe2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nutricount.cz/UserFiles/File/difafu.pdf In PDF document text
    • http://soft-pro.hr/upload/datoteke/38961697392.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/16306520864.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/pifupafaxifipiw.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/wanomep.pdfIn PDF document text
    • http://m2m2design.com/userfiles/rozagafu.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/gufobezitajex.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/jinixitokeso.pdfIn PDF document text
    • http://mega.kz/media/upload/files/pemosawepizesu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342f71d4c17---157827346.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/75472018705.pdfIn PDF document text
    • http://weldingplaza.com/files/file/nogipurirujifefonajusof.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612effa403315---dadotaxaviropesalixomun.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/mogofurofilenifute.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/57274534106.pdfIn PDF document text
    • http://reichspfarrer.sk/file/83285761897.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/gerodewixadasafigutowoba.pdfIn PDF document text
    • http://maribon.net/app/webroot/files/userfiles/files/neweru.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/pudawiririwivepiwi.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/jepejifoxubopadujibovix.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/51200678906.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/12557954055.pdfIn PDF document text
    • http://allier-genealogie.org/File:/56478182540.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8079e307b990db2f80bed86b6667f25a/luduvadimawok.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/64484430015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+wallpapers+for+iphonePDF 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_off0000c4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AE 10564 bytes
SHA-256: 59271d50bc4297646eaec35133ced4b0a9f087a2cb4b25f4d61e20dd3cceca47
font_01_sfnt_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 17428 bytes
SHA-256: 06921b43b603b3c3c1fde4d7ea1cff8cff630eab255cf9913b754ff74a11bb9f
font_02_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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