Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c38891136d7ebd…

MALICIOUS

PDF

80.4 KB Created: 2021-10-10 10:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c08b8b39d7e4c6005038ba6d1b2298b5 SHA-1: add43c81b8166e046e193a57bda94960f237544f SHA-256: b9c38891136d7ebd0c69d807ad6009fb54d7411dca2ae28d7f59025540d3e6fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a lure for users to click on potentially harmful links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=what+is+the+fourth+commandment+of+the+ten+commandments PDF link annotation
    • https://stw-nowogard.pl/download/file/xobikavimidikegodit.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/66101784582.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5b0d96c79b355db2fe56ce114d118de2/16901505284.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/jonokezokefaxivumanulol.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109270931228960.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3ea4c53e6---46552137008.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/mubezivezosewiniz.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15336002644.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/pilelalog.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/notarewijoguvifij.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/nivujipizexugi.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/1497144867.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109070420246192.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20211006013455.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/10387571625.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/74473273348.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/86829270603.pdfIn PDF document text
    • http://chinalabware.net/d/files/75893846868.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/lamepumafosotusebidatipaf.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20211007041940420.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/29542711001.pdfIn PDF document text
    • http://altinay-law.com/images/file/46461344983.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391c3298312---73985385461.pdfIn PDF document text
    • http://mrrb.nexgendevgroup.com/files/bobode.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_off0000d5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FE 17244 bytes
SHA-256: 045e8e2b74c81518179ff5e9c63615963a7a29067659d1b77b02b5b0fc0d0e26
font_01_sfnt_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 10788 bytes
SHA-256: 91b0c0bf708e1b6fabd1f30e963c8da76061b104fa2b0d6ea7f5fd09ccb5824c
font_02_sfnt_off00011b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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