Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a17aa94609f2ea…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 07:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 042325bedfedf6c4aba76ad33b4c0acd SHA-1: ba0fe448bcd37e0c014296d83d0fad7bcc0a7ef5 SHA-256: b6a17aa94609f2ea83a6bdec9d4cef26955c5d44fbb3dffe658e325246d5445d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://philabc.ru/uplcv?utm_term=year+9+entrance+exam+papers+maths PDF link annotation
    • http://lahma.pl/_u/userfiles/file/fuxaloludowituxixukixaraw.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/97966856302.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0a3e58ad3b63c3c4115f4db95cbdef84/luroma.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/rupusazitasop.pdfIn PDF document text
    • https://svltv.in/userfiles/files/51096051197.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ff6857a756339782663cbf0ab9e23df4/82155103802.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/67361198865.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/79850802.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/nifel.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/wadawepesekewuxuderewex.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/nazaw.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/xelofobofarebemosufuwifil.pdfIn PDF document text
    • http://e-hematologica.com/users/file/58968014722.pdfIn PDF document text
    • https://rm-parketi.si/uploads/tutukixebiwavewaruto.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/winuluf.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/fifujomuwam.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/65792652714.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/nuvawexuju.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/kepepageximin.pdfIn PDF document text
    • https://websbag.com/uploads/files/14202949216.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/12787443312.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/91646244287.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/46036543885.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/mivakewiso.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5a6096a01---wozajabuxunilexo.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/688b61e2dd71160ec7795bbeeb6e570a/gonej.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/kewadowisu.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_off0000b235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB235 15636 bytes
SHA-256: c3e57181a2e486eb3dc39640f37cf92e8cc40e2d8c75eb6bcdfc8d96ee182d55
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 10632 bytes
SHA-256: ba5cf4bcadbf0ec9b4fbbd54b70ab491da14aef3b032802ec945dd441ac4d225

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