Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af515f84700407a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 08:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fc43a462248e13189b02ef33286f057 SHA-1: d9120e9752dc167072842bacdb1a2d10c20bfda6 SHA-256: 5af515f84700407ae77002c39b5cc4f1636989c763713f0aebe2c97e40f2c1aa
204 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of multiple links to potentially compromised WordPress upload storage and disposable hosting sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be instructing the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=combine+image+into+one+pdf PDF link annotation
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161002461200bf---wuvajuwagepe.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb06fd67a87---vesojosutixef.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a224bdca65---57145615290.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/80321424949.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/561738132.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ohb7vp4h1bakfb1tan9vvd4053/83518940512.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609734debf319---9348693193.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4a252ec42841c9d07beafde6bbb88a7a/25304982771.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/towul.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966ed796b4f---kosaponi.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/98489737170.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/xafedasetetowevi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1c5406f77e89e80165cb97659041913b/juzejakixa.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132b200c590a---mibekajudulerowujo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/84c0306032ed4761fb968674f7d424d5/3432068655.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cc64047e30899d785a03aa52298fe58f/livikegalu.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/zepiloviwej.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/jelajaviwe.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/74392996354.pdfIn PDF document text
    • http://domplus.su/userfiles/files/1115695977.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b32c7e9e1---dizukavapurazodaz.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210801_1758B493E7FD56E6.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/5206076195.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a6f901a3659dcfadcc50c4c177bf8d6d/73470507775.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/donewisebuvojunonanirolu.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/satokajusisupanefesebelok.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb75b6962e---41897752961.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_off0000d278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD278 10696 bytes
SHA-256: a658f1be4906d6314ce16742c311ed9f1e04c78326a5b15d2c20dfd238d24f67
font_01_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 18660 bytes
SHA-256: 3c19e9d17767bc7684ac37dc2392e5e703a46bfd1fc5d623ef51a976c7d084b6
font_02_sfnt_off00011b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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