Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf727c4d516e719…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 03:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d67fc8172726a8d845f214edd6d723d SHA-1: 7ae81a9fb73e0d777feb77b18dafa846ad862385 SHA-256: edf727c4d516e7197a85b5836daa757524348f27262f11098c7d72ae217622f6
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a browser extension or update, a common social-engineering tactic. While no scripts were directly extracted, the presence of numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a multi-stage attack designed to deliver a payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jss-moms.si/upload/File/3854582408.pdf In PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f45b60c3a---41771800362.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/61705338407.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77851c23e9---luneserilabezesom.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/8c5750e313cb007b71a9522dbc73e50f/sokefoxerotejide.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/o7uhrjclsb8pnhnhv754oim875/wunotadijaw.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608244c470f7f---63805411800.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16075445656b4c---likebevubotumapusa.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/vipurefejizevun.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/cnrvqms0cusucajccr1luvhrrk/81743064505.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160949e1d7dc94---genisidaxatuzawuken.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210722_FBF537FD7FDBCF19.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/49874319371.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/sigawepeme.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/85ccc9ef15a8fbd578710b79fcb7d96f/55863897593.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/26302228446.pdfIn PDF document text
    • https://clubon.top/uploads/files/5571177109.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/misakokilefojivukoso.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/segitajapulusuvusilomax.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923bad05f40---sovipowal.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/20147819624.pdfIn PDF document text
    • https://losungversorger.com/product/file/69154508543.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/nagegimojimumiteb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=free+download+pdf+nitroPDF 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_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 17756 bytes
SHA-256: 78a15e78a2381d4324496fae3d07744c288a95778f17a19621a369fb4c10a08a
font_01_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001263b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263B 10384 bytes
SHA-256: 42e08ad52586c23d1baaea4400adf7b1f3fd5b5809c5d3ffebf401556f8ea363

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