Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff18e86b0e09db87…

MALICIOUS

PDF

89.2 KB Created: 2021-09-01 19:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a4a0f0dd07b1d06a1029195604635fa2 SHA-1: 67af3bfb18ee97b91083732f03216c591d251b74 SHA-256: ff18e86b0e09db877ee75c24ba850b5cebf623aa2f89de2f94031710387fb356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics suggest this PDF acts as a lure, directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=who+is+jax+in+sons+of+anarchy PDF link annotation
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607859012947e---somutupu.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/liruvivevazirunelabetexi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/868825b9b6f71d4fb9a39cd3b0677ed0/latapifakilarij.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c143e912cfd---kuditigi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc5ab3247---14956652938.pdfIn PDF document text
    • https://ancoraeducacion.com/images/besedabunojuwofiwedaru.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/25b8c993d4fb690fdb2985620d9494ba/88038341344.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d621da4b002---putetafunupetovizilexel.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/67299356744.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/risewiterexib.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d356df2220---400241588.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/22606617771.pdfIn PDF document text
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/sitofoxobanexilenuxuv.pdfIn PDF document text
    • https://cncunse.com/d/files/85561848569.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ffb78328f---32765461184.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/wijegotekagosevafawedorix.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de114e4812a---moximevilivilulilez.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da10195770a---6554390999.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab030b43745---9076682043.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/52136483355.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/10809355056.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/fokawita.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/58745916866.pdfIn PDF document text
    • 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_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 16980 bytes
SHA-256: fa699e41dab06019eb141533cce0aefa273f90738213a63f77223c28590e2c2c
font_02_sfnt_off00013e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E32 10496 bytes
SHA-256: 545a48640a245e45d9217cb7feb8b972f6647e67694ac8736b8cbd9d90103fc3

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