Malicious PDF — malware analysis report

Static analysis result for SHA-256 589e39bbac5e3f94…

MALICIOUS

PDF

72.5 KB Created: 2021-09-28 22:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 588aa783ddb920460eaaee8a93d5eed5 SHA-1: 75904e41521649f4cf02c8d5ea1c83a9df27284e SHA-256: 589e39bbac5e3f945f4bf952c84194b620c115f991e78df9b1753eaed9e7f847
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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=how+to+cast+mobile PDF link annotation
    • http://www.smartusb.info/images/library/File/dadolagabupiziwavaxose.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/xomisixuvitudasu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148beb7864e2---53762396725.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/xunusedafufuxunupat.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/10227536313.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161467db5666b5---ronuzuxabisif.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/wisobeduxuraw.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/41343065023.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021092322531_430387662.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/pebafitatuvevutupe.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/45604384467.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/22066444251.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/90070056605.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0225f3939967ddc0f01cde69c6414b24/20793722821.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/88240473229.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/jigewanukatud.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/53850515418.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/23270948775.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/pijoviju.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/66272770662.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/xasotetewawutafa.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614631848ece3---wufoloxojupagodale.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/94874827836.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bcdb87060---60149544952.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/35526734448.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/11962344624.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/wusuvazimebuvoxomisize.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_off0000b71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71F 17720 bytes
SHA-256: 67b258411fb3f4b8d972c63675e78d0c0f3a1504ea50ff7a555a8694c6cab791
font_01_sfnt_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 10404 bytes
SHA-256: 585958fe47e338892788458c719b578622cdfbe02e3a91b9514fd012dfb1d552
font_02_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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