Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05831bcfec2f931…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 15:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 078887d6345927cc438544cc21da2865 SHA-1: f7ed444903fcc31e1a1e196b977aec2354226588 SHA-256: b05831bcfec2f9312e72e880a7e150dba2f13689cf63b5670bd38dd8d11283dc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and uses urgency and download button lures to trick users. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4372225b4---30205798735.pdf In PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/30181268251.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/45357566558.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/xekiponolomoxobef.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/kesabodukutaxuxofafefefiw.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/nanimedubowiv.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/8f19f91f03cc58b5611f1722e6385454/92528964218.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/58691856762.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/gozobilijo.pdfIn PDF document text
    • https://stvorki.ru/files/file/9077824999.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/mexemof.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098409e2940a---vixoruxo.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/bologuduwutaravurilobofo.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072836529cd6---mowaw.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9f846899---jebuvebumerodefuximupudaf.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/tabumuxejuvogivugabogex.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd2a34014---9970675988.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/76782113528.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161277835105e7---ninogoxorafupulizurajekur.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3131869646---8147888203.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/is2rlbanlq8lhn1mp15fh2g4s0/tuvom.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/8096972711.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/dakuwoledexuvemosenejato.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fsl48qi4i4ghg6hkqrsvjso1e5/nuxewuserize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bailey+and+love%27s+short+practice+of+surgery+26th+edition+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_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 17448 bytes
SHA-256: 7edfe5a496eaf753b5b66212ca148d5848a1cfcf9e6bd09bdb60912eddb27579
font_01_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 11556 bytes
SHA-256: 3c5ac1e2cf5ff44d3a3922453448182362988b2c1a32f962995602a65ddbf8b3
font_02_sfnt_off0001382f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1