Malicious PDF — malware analysis report

Static analysis result for SHA-256 9182076b6a50a048…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 13:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 943d8768e1bf36173c32cfba0ff69435 SHA-1: 90368b0e165d242d1d711a195d006bbe735b9e64 SHA-256: 9182076b6a50a048e9e44936fac44fb14151184127156ec0f7cb05b0c8631c7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=the+magnificent+seven+2016+online PDF link annotation
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161372b611b720---mapotaxominaz.pdfIn PDF document text
    • http://santabruna.cl/upload/file/jafin.pdfIn PDF document text
    • https://masihpt2.com/contents/files/xabiwukuzuna.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/zisajulolazubulesomar.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/xuzumerajaxoduradazefowep.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/xosimavegafewaru.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161477cfe8cc06---binozofubawafimojivomowut.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/pijepoginiwakoma.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/tofaxezawirano.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613927cb0c393---karagodajinexodirov.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/91312630811.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138bfb314524---91722554201.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/mudisofuwurep.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210905055529_1068605832.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/batilavilitinidiwa.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/gegukovozusagiwuxerewotez.pdfIn PDF document text
    • http://www.pilartangguh.com/file/79810310395.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/ruvozudataxe.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/dadopawoguzuxajuf.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/39947112900.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/wixeba.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/fizamoserarufa.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/wafozeji.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/efc30355da4c527756b74213720acfec/jelenawalumob.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/lopapovegaratofunudibor.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/zejilafikeveso.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_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 11172 bytes
SHA-256: 45d79a42512fbdb4476fc698566d0a664d1b9ba6ea8a78f14b19b25a7ee56196
font_01_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 20804 bytes
SHA-256: 26cec66da94c4dc91c46408409c2c1e886511afcce1275fc9f8c44401e261ba5
font_02_sfnt_off000128d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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