Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd58bf3b937f1e86…

MALICIOUS

PDF

96.1 KB Created: 2021-07-05 08:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1b2405d96f6f9a8f8070d37b454a2610 SHA-1: 09f6da9b194161c39af8605860220e3f807e5ba8 SHA-256: fd58bf3b937f1e867a2b5f738b43a66363bc2b8751a8f71ea212b98f68905619
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and a high ML score indicate a strong likelihood of malicious intent, likely to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2lb6ce60im6geb0u9rii1neikf/pemopigekisulokojut.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f01a4a074970732caae7d2c6ff087cb/41947863046.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021514105263774.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/204d7bdf63b9b9e8dfe48de0612dbd8b/zavupilavosunituli.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b5324141f60---46368492495.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/30282404684.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d679fa4e32e---viweperizubuwasusi.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/dj4s5nqg4mm9m8cls7f2crjhgp/89534710002.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c93ec08b3a---fisekok.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/33386375795.pdfIn PDF document text
    • https://ijpdua.com/contents//files/mimijikogogavi.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/juwaluwubaviroladepawat.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e115ba83b60---29577852855.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/88211851443.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607539762d567---1527123151.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e0fb3edc06e63511deeb0f2f1d4bd192/59575139310.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/cf39d73baecd2262624f26375e7ea002/54248503231.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210628_C76F961398EEDC24.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/qvi720872e9eup230gei9rle10/49895386363.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/75088ceb52a9ae5ca60e93e4ca48a84a/25287203420.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160759962069d4---gotobav.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210702183056_73336063.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/73919704850.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/dirs3dfs5qjoohjmm8ifbq1rr3/31272377106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=who+do+you+call+to+report+a+bad+landlordPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 18664 bytes
SHA-256: 774c8b366a01360c1e5a4b4f63829d4546d12a1bdffab8df40cd53b4e04cc963
font_01_sfnt_off00011ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_02_sfnt_off00013794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAB 10696 bytes
SHA-256: 7ca962e90b2fe86f025ca41aa1ac783f067cd4b959bb23c407f574fe2813025a
font_04_sfnt_off000167f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167F7 2268 bytes
SHA-256: ab818928fc077df21b67fc06afc04921809b57772c79eb29c4cde4b5f904ea9f

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