Malicious PDF — malware analysis report

Static analysis result for SHA-256 114dc5d091af8eb6…

MALICIOUS

PDF

72.5 KB Created: 2021-09-15 22:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2a16bd025b91e2a30eaef4198c827a60 SHA-1: 46767bc593983c0e61007e5fc4f24c1bf0d3bacc SHA-256: 114dc5d091af8eb6ead09c9c908478a0ec3bec558bc7d04391285ca13ed2df04
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/69f35dccedae9096c205348c14eee09d/lemidolozikenad.pdf In PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/kametiwupurudo.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/32949520124.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af9eb21298---70029079057.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/23438312096.pdfIn PDF document text
    • http://elsped.hu/files/file/47488720927.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/gifewagetavuxewelidisivij.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/netax.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/16360902212.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/72197071936.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/17f7efbd0be83f3f7afa2595a46f2b53/8675776656.pdfIn PDF document text
    • https://kimcert.org/E/file/38169624412.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/76412706108.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/48885722588.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7d8145d9d29c4d64b6d1a1471810cdcc/bikivoj.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd65072ca6---fexomulavoratasuviwi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422c69a8e4e---wosefonofokusisusokisege.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/jarolufuvegawowe.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/lekopimopibezudinitak.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/fisutexabibibano.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/ropozuzukefolubaratuvinur.pdfIn PDF document text
    • http://mq-water.net/upload/bilagawilizodigo.pdfIn PDF document text
    • https://clickbox.ro/images/file/rulitugikobodaxugetak.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/pigebix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=coc+new+update+downloadPDF 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_off0000b911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB911 17048 bytes
SHA-256: 868d05f2e81882e571e29282fad9465a7c88e6e9aa76724d18f41b5f6516652a
font_01_sfnt_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 10364 bytes
SHA-256: 5ae3a5bd3a611d351662e50e1bad64e20561513bfcd67031fddee316df07d1a6
font_02_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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