Malicious PDF — malware analysis report

Static analysis result for SHA-256 f321ddc44a46cf5b…

MALICIOUS

PDF

79.1 KB Created: 2021-06-29 12:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e840e7db192ccc8bd590196240a3752e SHA-1: da95d79fedb832099c7905f1e38b6ded8cd4771b SHA-256: f321ddc44a46cf5b87eb35f9459b5d89666f9aa6e89c6f794d4cae85b7655d8e
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple websites, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The document body is unreadable, but the presence of numerous external links and the heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://aitrans.org/UploadFile/file/F1202105201011338756.pdf In PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16094478e45007---67083073611.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1852f0268e8bce76fb817015875f1666/kalidumo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75452dba0---93479049350.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/64005959075.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6e645cc0---18104103871.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608379b43a926---90028880408.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/18207408525.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/19013806609.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/pakelepitipitukeb.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e0a9dc5efa6ba2db92f023210ca50ecd/69457980646.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fdf443dfc---xalumexebasepeg.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607400d58b602---nemugizo.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/67948026025.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd80d4f22---gesen.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/vpr3im9n08v14i8n1ff7a6hrcr/vexafusonoxix.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099b54b1e7b4---44108902736.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/49161881632.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/zatuvad.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd35cb75bd---61923398870.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/29844749183.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/23505b0315c5b471ba36d82dba116242/29794837625.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d600089cd08---simuxobadap.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d023018998---20516744462.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/47246854533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=watch+harry+potter+movies+online+freePDF 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_off0000ced9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED9 17928 bytes
SHA-256: e9dbef17bbd68e01bc28b0dfda772c8dc362753b4dc273ee165ec55545882670
font_01_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 10916 bytes
SHA-256: d701df71e4d9f97c3860f995c4468de9eb6a4de0ca29eb4370b443c349ebd709

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