Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a50ee18d8b6f5c4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 02:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 544bd8a9bb206e3cddca3c2bd354b578 SHA-1: bcb66bab3f5770c1ef810d16a948e7612ac9615f SHA-256: 0a50ee18d8b6f5c4ce156b2abe4f6ab665e5ba2a1673b6628b5977159187a486
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV and an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=how+to+stream+vlc+android PDF link annotation
    • http://top1np.com/ckfinder/userfiles/files/pozivabate.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/25275141063.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ximudujujopemivon.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/nedutupudifuxozidipogaxi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe858f0b01---getexufiwogekirageg.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/62330677010.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1faf06060---devan.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/nifuxesaremekad.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/224981876.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/69971821419.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/vabuzunonep.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/11770699883.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/gegibesi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1e7c9c3a---32194820847.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/gedorilurofefixorivuzuf.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/5446465641.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/10be6878527209dc4d9627a6b76d0269/juxibezexunapezikemojef.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4efbbf8a---25128314302.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/naboxaxavomobade.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/nutajunakafaw.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/kiraxagarir.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/44959077850.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_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 10672 bytes
SHA-256: 49149da438b4486f592bcace3e19d2abe44a618f61fca99f39a3b4b9cd859d96
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 17208 bytes
SHA-256: 6a5d2065c2955c3678bd804bf979341c26305e3a69e42438a40a963f16756fd1
font_02_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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