Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba55ba82eb53e89e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 14:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7de8e4dbbbfe6ec84edd12ba319b041b SHA-1: 2cfc2436e55620e0b69c1030a14092ed97cc33f5 SHA-256: ba55ba82eb53e89e52df229f8277b91875865e60445635ee896573bcf907004a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristic and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://professional-tuner.at/uploaded/file/tupebitiwixuk.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f7caf938a6a6281cc5e60d68d66cf1d/78887743271.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/netogidarafopikofowikoduk.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/3ia63qeepu6m1vj67nveqmstnq/27648142910.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/piferimagubilonajeve.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/gokufurajalodufolitotawuj.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/34800592905.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4eb10149---kugegagexukuwiwagobujomu.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/kugoxevatofosovinide.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/nikonesolosa.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/kilukirorufoketog.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/84068922835.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/50020010188.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/janopepunaz.pdfIn PDF document text
    • http://kaies.net/upfiles/210919205217800730dyv7sb.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/29348902375.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/xivijapagugogepas.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/xubixirajojoboverasax.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/640982509.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c248441a5---77041721592.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/21023131804.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/39286059197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=redmi+6a+bluetooth+versionPDF 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_off0000b026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB026 11032 bytes
SHA-256: bb0c0ed5e97d58b24945a6c3f96be9f277ae63834473b4bf84df1216c80f5d85
font_01_sfnt_off0000c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 16092 bytes
SHA-256: ac310ca8c6572850610c191c5246c58b361b6c43f019814fbcb4341808e9582e
font_02_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1