Malicious PDF — malware analysis report

Static analysis result for SHA-256 e165cf2ccf0e845e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 21:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8de83ceaf34f56d0a29b099f54b6765c SHA-1: fa0110e46cd04a0ef4aa9c21b2649f775b61eeeb SHA-256: e165cf2ccf0e845eb1e4b40762c441e526f7dcc618b24b213acdda8935140fe9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, multiple heuristics indicate the presence of a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host or redirect to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://espiber.cl/images/uploadedimages/file/56548177138.pdf In PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b556ff44c0d---9818199657.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ce5ac1d0---xanifod.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/80199548061.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/tokorebipatufe.pdfIn PDF document text
    • http://veitali.com/upload/files/kabofusiwuvabugalami.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b78fb1aa5---fopipijuw.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/2a1c13c8544318c2f69c9998d92be2ac/77647548782.pdfIn PDF document text
    • https://auto826.com/uploads/files/veraf.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/34724544245.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/54729102067.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/48719317898.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/tofefetixudedajoz.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/kojitukeleguwexezowopigol.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858587c2a91---xipudoxuxogafovurawutoja.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/31852998529.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7130e0528f123233f3a88608facc4c1c/movigofuluwefipivimufi.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/fuwolor.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d06b4e8351---pemubedofo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ada106b6a1---lerikowuxipukupij.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a87ac1bc41.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/zenefikata.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/xagolaxopiwira.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714049470ce---63739866642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=minecraft+automatic+cow+farm+and+cookerPDF 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_off0000c2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F0 10692 bytes
SHA-256: d64248e5fc17f64af25360ad67414e3a70dafcfd42a01fa17f7357b765d8ee3d
font_01_sfnt_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 16256 bytes
SHA-256: 98ae8e01181d46408eaade12166360fc89aab8ce315700056b0f7a0bfabcde98
font_02_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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