Malicious PDF — malware analysis report

Static analysis result for SHA-256 5896b17a1ae63570…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 05:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 87ba32a09a20bc38d25d73a2dd593b94 SHA-1: c6325805be397a51cfa1dbeb0b91968a0487f96f SHA-256: 5896b17a1ae6357063c7f87671b2de383ee7e1132059a8bad12704c7a220e802
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a social-engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware delivery. The document also contains numerous links to external sites, some hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism. While no scripts were directly extracted, the presence of PDF-specific heuristics and the ML classifier's high confidence indicate malicious intent, likely involving exploitation or phishing.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://wastran.ru/uplcv?utm_term=dark+mode+for+chrome+on+windows+10 PDF link annotation
    • http://cantinachitarra.it/userfiles/file/67435038010.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/tisifu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135120a65aba---93384944142.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/78534509329.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/88739696825.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/labobure.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c45ab76d---31721967700.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a608707e44---67004046287.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/bujowomilaz.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/65600098469.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/92009741348.pdfIn PDF document text
    • http://hzqzg.com/d/files/ponujisiv.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/kexelufebokepixumix.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/fenomamure.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdf9d79a62---73667437048.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/rujewufukixejunufap.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/puporaw.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kudelaxemuzojuxobejifev.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/25002715174.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161429cb98b81d---temojogomasol.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/sogewirova.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/92743250155.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ab9241a2---86326678043.pdfIn PDF document text
    • http://cartopack.com/Images/file/70513784591.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_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 17840 bytes
SHA-256: 7ef244ebe4d35f2548be11179f67a0281ef10a3d5ccfcb1b81e0a83c6ea3d154
font_02_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 10948 bytes
SHA-256: 9336a120a8722497ab0e15f86bc160c1b2e68963c05d00919dce430c3e9b45b1

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