Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8121ae7a7af0f49…

MALICIOUS

PDF

92.1 KB Created: 2021-07-01 15:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1ab47d53647755b233a6d0f67bc54147 SHA-1: 6dbb65b1b18a19aaf8a78449e79388a0b5273ac3 SHA-256: f8121ae7a7af0f4924ea15aca5a13617f75776fc58e50cde45441b90cf2a1ac4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting sites. These links are likely intended to lure users to malicious sites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=airy%27s+theory+for+silo PDF link annotation
    • http://kirilmazbardak.com/userfiles/file/91955746019.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/5bd82bf2f47ad914c76830b2a21ffb96/38799512469.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c05fc57cc---75865660017.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609adef45f394---47731157977.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/59775296644.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4b08684e1e3dc7ee8479aab9dd2b75f/4508508517.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8ecf039b7624225550d9f8554977264c/rifalugorujixateramaki.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/1426430549.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/lajawikojidozoregi.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43b28c507---63775387534.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210614_F6ED229C6A7157C6.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/ba78b4818e5c55dcd0691f6692d9b968/pogonavutonulufosofoke.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080be7ba1a55---26819172451.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/rexegelirazujepu.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/tasuwujafetodarubagozo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9b495ddca---51567042474.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/rmf36h6hdbuorund2609aceo1e/pobiwum.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bd461d8c8a50eac9b28ad36253ea6658/64013921975.pdfIn PDF document text
    • http://jucal.es/images/file/45335783001.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f8d4ccfc6---76884676951.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/moguvoda.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/85818646294.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/76633712339.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/14858540170.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_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 10176 bytes
SHA-256: 307276ad1569dc2ab83bb6ddfea412d70d24e52acb8fc297311a6058709c36af
font_01_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 18812 bytes
SHA-256: 936371270a83965a271377b0f01743398932ff72631a45fe6d92a16714baab5c
font_02_sfnt_off00014b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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