Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5ed109e5cf0798…

MALICIOUS

PDF

78.1 KB Created: 2021-09-11 15:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfb4d2deff7a13c9386855dd5b19f638 SHA-1: d1f30c594fdb714fe3cfb2ab6c9a97f751219e4c SHA-256: fd5ed109e5cf0798e31ad5169313d2653045904db0de8ba7f3714fb6e469469a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://kfbma.org/files/fck/file/76052108036.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6cd6ec66eb17136dc92fec539e6c0afa/jokepax.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/mijawelurojolojixelo.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/49122903107.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/300513e04a795a07d2e9d943c665574a/pupazove.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210906234803.pdfIn PDF document text
    • https://cncunse.com/d/files/bugilawaxexopum.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/65425443595.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb63d08e9---gurikusulazupi.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/kufipuweferaso.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/81272602165.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/ginuvajaxujime.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/vutiv.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/xowip.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/62776906441.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/zaxobabigevulagini.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/49499785856.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/96155666397.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/ludawesijununozoruf.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/52211980819.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/dudiludibidunimewejonudu.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/92603655944.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/vabetokupaxakivigavod.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/nituwivivikif.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/laradiguponanisupusabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+remove+ads+from+your+phonePDF 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_off0000cb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8D 17556 bytes
SHA-256: 54913ea68302a6b7426698f863af4cde7094a1e3cfd935e58105b2f99b4e7237
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 10980 bytes
SHA-256: 539e338b645e1050fe107fc12d9d53d02797f0c7ca5cd3efd592abe11bcfd63d
font_02_sfnt_off000112bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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