Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8d8dac9df5449a…

MALICIOUS

PDF

89.6 KB Created: 2021-06-30 21:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3b41a1f4ec152f3e232ae6f04b30182a SHA-1: dd5a26f7af901fab4b2532e20f9f31810d6aa252 SHA-256: fe8d8dac9df5449afe6a75eccf8a374ed368bd506ed2eedc224d3b464d3352a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=pubg+game+song+download+mp3 PDF link annotation
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b97c2badf23bc075017912742eba454a/fagesiwajikuwezirujawaru.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f8aea4db69ce3843f7365a9f45bb92c7/sajisiralesedeb.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/45235547972.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afcfb165102---jafabononezugugikonazofol.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/dolojodegakudesola.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/vajitomoxitikizugukajub.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/51ja0qshtu38koqs0bsnjjg0gj/xokavovewoxivijureturanog.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/3294757620.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2cddql7e0bmsegkio6s1f7a1c1/rojobemafukowotevur.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5d51146cb---54526866417.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/44bceebaf8588b451e8e9b610297cdfe/suvitadunenotetev.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/51298801649.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d3f6af133749b28eb163613307e8893e/tizavinediwesez.pdfIn PDF document text
    • http://kleiberit.ru/files/file/sulevabetumupimin.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10bcd40c96---99230493126.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7d1031248---zafudipekimutixaxedosiwa.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3n9pvi5q4ncp7amgf484055bct/rujinatokotezaxunowitexi.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/75755415246.pdfIn PDF document text
    • https://digireg.org/upload/purorizevonag.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/glcm1dnsavcr4hjtej9g7ldrt5/bajegonate.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/riwoneguzazuridulanopo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4a27f366d55dfd01dcf66d2a4800b34a/55039015711.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_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 17756 bytes
SHA-256: bb17f897a38680737d149568c0ece1808ba15c5019e57ff8a0b4dc9f972d08fb
font_01_sfnt_off00012827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12827 10944 bytes
SHA-256: ccf068597b59d22142b21504454343c600246a6453916a0093ebe6b45a2f07dd
font_02_sfnt_off0001412f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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