Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb20acf9928e81e…

MALICIOUS

PDF

82.5 KB Created: 2021-08-21 21:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9866ffa8c41c93ca7d24b52409526f9 SHA-1: a3bc5b624e410ab021336d5bc81dc008b9edcc50 SHA-256: 2fb20acf9928e81eea50e12773bb60651d194010bead4cf384fb307487419bbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=fallout+4+settlement+size+limit+mod PDF link annotation
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/4dedb91b1430ebdd5f48df57a1eee1e4/jipexomatu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5f972a511c---11025121151.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7efea82ba---ruwusatorokawasil.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/88806224255.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/kodojadigesusurogitarumi.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jqmj077tg72hreim5itfe0v2m5/xogubiputexokuv.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/sinig.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607474d6e22c7---57328409211.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/xezaw.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0db2cae8---xaxowumoxowam.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/zugojilifisegozawutat.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ed1f6007b4d95c31d3e18ae33e902793/temovigemuwel.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/21a8709110d038a504364e66c4806809/kinujewa.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9isr4uitgmud5a2kam8qlt6m2g/memijifonapo.pdfIn PDF document text
    • https://latework.cz/soubory/toreseteramunifasafu.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/9703049508.pdfIn PDF document text
    • http://princeverma.in/uploads/files/zafozebim.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/fopuziruvijukapodipa.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/85696524998.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/f6f100.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/a21689306de93f1b8e1ea34fe0333c80/zaduporojigowaxaxuweliv.pdfIn PDF document text
    • https://kermanrooz.com/img/files/tepifoworasanufodeb.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e11ccead7---3869917780.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/kizalolawufefedo.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_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 10524 bytes
SHA-256: 6aa02450e93fafba3697b94f265851e61205c212d2953c1c05ef74cbb01baa12
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16952 bytes
SHA-256: dab5b37e6bf006814b8a747c586403a9237fd32025daab45e7d8a5775ed7d699
font_02_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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