Malicious PDF — malware analysis report

Static analysis result for SHA-256 59107d955e6f5aeb…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 16:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5ea6c705b8269d53edf02d233a440b4 SHA-1: 160f2c7f68967b2e66792d021ee72ad4218210a9 SHA-256: 59107d955e6f5aeb6a20ed41a8ff64873bd53fbe2c2dafea8fd02a65c4111c07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, including one pointing to 'https://inwebjor.ru/uplcv?utm_term=tv+empire+tycoon+download', suggesting a lure to a malicious site. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent of hosting and distributing malicious content via compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=tv+empire+tycoon+download PDF link annotation
    • http://thaoduocvn.com/userfiles/image/file/jilawirurusabekimu.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/tunulozinifumupu.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/43925884742.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/1103d74824d36f4cffdda08a65a58938/judizowoledulupoba.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3e68c9d9627b26d7c507c6a4d8016459/magarukopojuxevenojukok.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/mofoniretovineboxot.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/wilorizajoxelo.pdfIn PDF document text
    • http://climtech.com/files/files/95418818169.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/vogotarapiz.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a1bc463e8---3021316916.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a39d37773---68655676400.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/rigawesewub.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/bovojejizir.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/lunezesipe.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/pekilam.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161400fe513325---73867538169.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/43397064169.pdfIn PDF document text
    • http://biomehl.com/images/content/files/xobefapeke.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/25938494343.pdfIn PDF document text
    • https://unosms.us/userfiles/file/xixozukefilolijilaz.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa1d8524f---14388680443.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/noborunuwe.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/67058207308.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/51472648652.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/wuwirig.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_off0000bf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF55 15700 bytes
SHA-256: 1b02b06f779be028e875a970f8e1aca60c965a2a1fa7c4bac95d4de11367d04a
font_01_sfnt_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 10736 bytes
SHA-256: fb481ef92913593dfcb7d9ceb220753fd1fbc742581dd69fcb8de150e66b28de