Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd50271116615265…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 00:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb4ab3e40c28c1fb68690811754726d6 SHA-1: c325d9d18a200f25643a12ced018ac167b19f458 SHA-256: bd50271116615265c7652ba5a1e95cc613449679ac43414816395298429383e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of embedded URLs indicate an attempt to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=online+word+login PDF link annotation
    • http://melly-incendie.fr/img_db/gekupogepinibovagi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130923bcb24b---83568864395.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/duvulaf.pdfIn PDF document text
    • https://ka-base.no/images_students/files/natulukuvowutifovugogoxuf.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/86112133189.pdfIn PDF document text
    • http://bresky.cz/res/file/zebaxuxulosaxa.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/fivobinifuvikopipi.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/rabafodugi.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/62480804791.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/53307165984.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/30224638961.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ca899ae188400fcc3239e25800d969cb/79900399971.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/wuridopor.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/sifelebafebewuf.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/jevap.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/vujaxiboju.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/bejukazomazuvawol.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210910011619.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6ae5997512e19680e5032edb08d89115/51665206452.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/7594581831.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/tizarulelaxik.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210905000324.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4a794543---29668174239.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/desakokuxinipemepanesilu.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/vupipixomikuxotite.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/gunozir.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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 10108 bytes
SHA-256: aba045a48b8e3ae64964610fa663eddb934df40bcadb3765724b8c72ea740aa8
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 16928 bytes
SHA-256: 6a19ac9ee7b08734f9b1a7ebf0b9da4db918a1adea3a00fcc23a9e777f556956

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