Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc063ce2ffd08e97…

MALICIOUS

PDF

72.0 KB Created: 2021-09-23 19:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 894d949c084af45c74fbac84537fd697 SHA-1: d58314e44fd9fbb763b67cd6f73dcebe5c29303d SHA-256: bc063ce2ffd08e97748047b0550f900e69b8fb9a3ea78c12744828c07f2f4e08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The presence of JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=rules+of+survival+free+diamonds+2020 PDF link annotation
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gimi73dff3jtvakodkkbb6dgrq/87226040386.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/249b2033820fb85c1bd519d2186a0237/femufazowar.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdd05ce671---vemelebetixevukajuzamipos.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/xarasagewoxowilon.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/libojetupujero.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/tewejatolani.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/161e6b4596bd401f4a39284431271603/47302272750.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/39260338437.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/vulilegarosim.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/veporasak.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/kuvixug.pdfIn PDF document text
    • http://agilesolutions.in/uploads/gutuwidigajis.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/64011778639.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/26285542104.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/sudobebibisane.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/53953460872.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/66sqti24vr3vlvj6ll0pq984ft/fozidegepodegenajiro.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/25816443681.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/kudizosajoligazejatupul.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/87998798073.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/27013065534.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/jifodapexa.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161408261d79e8---54500903252.pdfIn PDF document text
    • https://healthresearchinstitute.net/userfiles/file/64843887521.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/kudopulosefajok.pdfIn PDF document text
    • http://kaies.net/upfiles/file/38304495587.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_off0000bacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 15000 bytes
SHA-256: 608a85a9012fa6f7aa3232d194b40453c98d5469e5bb4ad2e70a76a64a71244a
font_02_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 10872 bytes
SHA-256: 8c538fd951ba9604c76f59685b5f24e2692c57b24a954cf66915d5a9695577a9

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