Malicious PDF — malware analysis report

Static analysis result for SHA-256 54577bc8f6f63f50…

MALICIOUS

PDF

89.2 KB Created: 2021-08-05 23:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8c28b8a20c2ae7b4fa95bd8dfe203956 SHA-1: ef39d2c1fd954a4797f4faf4c56fbc7ab5f9a3a0 SHA-256: 54577bc8f6f63f50b9a94377b1c33d1d445de80127f442aafc8a8bbcab4fe698
236 Risk Score

Malware Insights

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

The PDF document contains multiple links to external sites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect to a remote support tool, a common tactic for gaining unauthorized access or conducting scams. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914167da28b---29574173776.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c60672c9de5---dalar.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nunutejiberifafa.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sofararamafa.pdfIn PDF document text
    • https://softway.gr/ckfinder/userfiles/files/sigibigoluz.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/55944140820.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e4f7c4139---32518276937.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/8970409727.pdfIn PDF document text
    • http://eva.am/files/4de7e3eba6d0e76a.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/zizap.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e04b2efcbe---vinolorifuturemep.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/winuzakafurisekubamoj.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608550e85978b---fotapelibiv.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/matidatakibogebugojobudid.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/83462166968.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/no0i2mrdud9q2a5h9pi3nvumb4/6915698457.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16a2456f8---zuwipikerijopijewanijo.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/narudumok.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/kutoloximiwawo.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080836816ff0---jebasuvoruxalevetu.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/72164431175.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29eb84ee4---vofufexomuwesujudanit.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16271415831366135993.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8937121754.pdfIn PDF document text
    • http://rld-carbon.ru/file/kofobulurubebigaf.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857a43c6b5d---70358027755.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/65404033903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=yoga+for+sports+iyengar+pdfPDF link annotation
    • 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_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 16908 bytes
SHA-256: 61224fabc89833ca506e5b4f1ff60545112d8b62983d3818ff1fe5c0432135b4
font_02_sfnt_off00013cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEA 10724 bytes
SHA-256: 67e6ce71cd5c4e946bca32058d5455192a1fcb50c872dab0a3eaa41a0efe5ed5

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