Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cad21b0551a2b14…

MALICIOUS

PDF

104.0 KB Created: 2021-09-23 23:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19a4cd9dce8f8bf3c8771f34546d1216 SHA-1: 6db97e9d55c986d6e84c5e8aea39e17f47446a4b SHA-256: 5cad21b0551a2b14d2995ba3b4cb04096f456a4047b9a4ac5aac3b3570818212
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external websites, with several heuristics indicating a link farm hosted on potentially compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for phishing or further exploitation. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://www.oneworldkarate.com/fckeditorimages/userfiles/file/85334019013.pdf In PDF document text
    • http://bulk-supplies.com/userfiles/files/nimudipilurezonepowe.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/japekonexilelewesixa.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/wazorapunuronu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1tmfto9qjf2di0d7783dp8tvf3/pudelusofutabupizuvotuko.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210916091733.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/16376245349.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/judixisuxerajuwevo.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/bobaralo.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/nutij.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/68425718808.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/75692040086.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/24347507863.pdfIn PDF document text
    • http://paradoxine.com/upload/files/70524255096.pdfIn PDF document text
    • http://wirheiraten.de/images/file/82409246024.pdfIn PDF document text
    • http://sbkf.org/files/files/95554531499.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcc373eb8---23097706282.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/35018838335.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/dunosag.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/jawetevefakuniligaxo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/fefb2d9581ae558898d03fecee280e62/23985935764.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/39a648a7436f4cadb77ebcf781c187df/14869159071.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/goxefemoxirevur.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/bitivubeburiwof.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/monede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=index+of+reign+season+2PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 22848 bytes
SHA-256: 42c57e1c78a32c3dc98df477dfa75756704c366b2ca36a40e2defcc81a5ceb35
font_01_sfnt_off00014b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B0 10556 bytes
SHA-256: 7d44aa78debac0a52a348b83afe2d6e4e8dfc81e8cd99d2e0310f1ca2adc3c22
font_03_sfnt_off00017bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB2 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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