Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c7ba3ea7007fa2…

MALICIOUS

PDF

86.4 KB Created: 2021-09-21 21:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc5994c014754fe6f1ef27494827a8fe SHA-1: 18557b60ba1928d5a9cc06d271206baee7723d6c SHA-256: a3c7ba3ea7007fa2b4c639b83576e9a7d8043edf770b80614331ba30976e7a35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF also functions as a link farm, pointing to numerous compromised domains and disposable hosting sites, likely to obscure the ultimate destination. The presence of embedded JavaScript and the nature of the external links suggest an attempt to deliver a second-stage payload or conduct phishing operations.

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 https://synerhu.ru/uplcv?utm_term=android+apps+old+versions PDF link annotation
    • https://grupahatak.pl/admin/_fck_files/file/mizuzu.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/kibelufezet.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/26043156525.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109152348242377.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/50744674551.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144301476692---53827741451.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/tames.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3opk8k6u5gokl6gsc3u9nmo8hf/98226241943.pdfIn PDF document text
    • https://eguiders.com/uploads/betonizupu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c09d5cbbbf---89599999309.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/liwedekutitu.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/fuzufanatasuwop.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///risepepojenasataj.pdfIn PDF document text
    • http://186086.com/upload/files/pulojedowam.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424b3217601---fiwan.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/zazizeni.pdfIn PDF document text
    • http://dejede.com/userfiles/file/43713548092.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/77776566276.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/bexivew.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/durozadixufabibape.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/ronef.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/dadomepetutisowogasikoral.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/gopanupezu.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/xamexitejasobisigevufiwi.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/jusotofatugum.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_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 17180 bytes
SHA-256: 64cb69762452658a996ef74044136a0691cde3a9667166d464e7dcb1e6217238
font_01_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001344a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344A 10336 bytes
SHA-256: 9937f1a59420788e503f359d70f985909da6914cfa6cae9d22bffc47527e6270

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