Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ae98740299e16c…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 04:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d52440ecf8112bf30e59c55fe223ac07 SHA-1: 15762d60cdf0c62f6049959e7e162b08490e54f2 SHA-256: 52ae98740299e16cd35025ec016b71f7c83f608bf2d3026ab3caf082f60d24e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://paliukenas.lt/i/File/bebezedugasasu.pdf In PDF document text
    • https://himalayanthailand.com/image/upload/File/zasevowitufawegabobaned.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/dopuweronuzepexaw.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/98297890722.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/wexeme.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608012dbe3e1a---baxejanuk.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/jasek.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/logete.pdfIn PDF document text
    • http://iviltra.lt/images/files/wepebogozusitugunuregujek.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/taxeniso.pdfIn PDF document text
    • http://bjjiffy.com/upload/tarekenij.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca0fd9ede---zexuzasifakudowekowumarim.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/sukukojokarexewivinalow.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/38421426454.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee96f422b9---27769971349.pdfIn PDF document text
    • http://tcihk.com/userfiles/71221567968.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d112731d3f9aa9296f5d9d05b1d4f771/luzalapavoto.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611f9b0a00d02---24384302924.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/gisopezizafawipupedile.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b4d8460b1ecd2b3eb31e2ea634cca90f/63965014539.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/jixuje.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/doremumetuxuniramew.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/2831400601.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/tosapilonibit.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/vijanorarukaruzimizatudoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=atencion+de+parto+podalico+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_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 19500 bytes
SHA-256: 2c37a0650f4324fe70c9ba6ac11326852123912cf4c8f8b420c516f780e102e9
font_01_sfnt_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 10424 bytes
SHA-256: d69c773fdff640c664864d7468b51185646fe18b14d33218bf88e087cdf67466

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