Malicious PDF — malware analysis report

Static analysis result for SHA-256 433201095002e2a4…

MALICIOUS

PDF

73.6 KB Created: 2021-09-14 11:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a6968cc90194769a1ab225ebec3e2214 SHA-1: 2f8ff9932f5558e0b6bb4bf3f5c71a70768846a3 SHA-256: 433201095002e2a417253b7c9a2f23ce5977fe82c339069df493162a72446e5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external links, many pointing to disposable hosting or compromised upload storage, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to download and execute further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tlkingatlan.hu/kepek/other/file/19556549620.pdf In PDF document text
    • http://jiin-torng.com/uploadfiles/20210912174645.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/dulad.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/jenarigogena.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/panamekisapimidusebodek.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/foloxa.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/20499561u06icqj67i7tco8o0o/gugigimulinutorixigik.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/18158919430.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/daneje.pdfIn PDF document text
    • https://terracell.pt/images/file/savaravo.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/dirajikivesevukinawit.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/48419846706.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4aea9dfed---12761647632.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/pewumera.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0a0a66c7---13796460987.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/tasumimuzitafigedefobu.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/39554718557.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/80041494874.pdfIn PDF document text
    • http://rem-proekt.com/f/file/18330137088.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/xisifijulujomaruxigiti.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/belonolikonubisomopiwule.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/62971848738.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/46400238900.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/90620415307.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/foxatetakudi.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/jagunovifusuvukote.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/46609556691.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be3dfa18f1---65974877007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wren+and+martin+answer+key+free+download+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 15944 bytes
SHA-256: 07562a3ea0bb8aed3460d84831d362e2016c768eb3b939e5264f94aef61a5b15
font_02_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 10944 bytes
SHA-256: 8178a816d0552d263911450eb846696b05e430bfffabb35b3327d4f82ba3e5d3

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