Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf7ff12afc57dd5…

MALICIOUS

PDF

72.2 KB Created: 2021-09-15 18:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 063f98e831b698c50940ecf5ec19072c SHA-1: 3471136fe635b100c8bf4007b22496d8efd7cd24 SHA-256: 4cf7ff12afc57dd5e8bfe24925523630f159caedb75e9353f927887d669fa9ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=tamil+dubbed+hollywood+movies+watch+online PDF link annotation
    • http://staceyasp.com/UserFiles/file/woritux.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/54567813011.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/panodaxemido.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/16957631504.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/zusogod.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/55238869849.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/ralojamoleboziduve.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3e6feeff9---52451114752.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/57133343709.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/41933004057.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/96315850891.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/32120582259.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/gijuma.pdfIn PDF document text
    • http://knipia.com/userfiles/file/34627672279.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/nujufage.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/pivameperepoji.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/58843083891.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///bilukelopejizesajazul.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133019d344be---liruxosuburo.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/bodenalebilewobife.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/27618887361.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/rosokukekelimigilopu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4fa118927e85f87de39501276ea3adc2/sumudilada.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d2d11a09---dujexukubemaxakogok.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fbe836e16---94988950705.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_off0000b677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB677 11004 bytes
SHA-256: 8634af421f4b1e875f88c643714b9a17aa6a5c7a3acbb0c36dd775fd9d2682df
font_01_sfnt_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 16584 bytes
SHA-256: 4bfff253242371dd2c2faeba77b72e2222bc3f019962c2487f880a7db89a64e4
font_02_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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