Malicious PDF — malware analysis report

Static analysis result for SHA-256 af09c1022eff6604…

MALICIOUS

PDF

91.0 KB Created: 2021-07-14 03:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: af893a7d57a304024655c4b60b0455c6 SHA-1: aa6050dee2b363e22a361dc6cf25f16a66318ec1 SHA-256: af09c1022eff66049cb890c6c49231703db96fdb0f110e457e7e1b0938d265af
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload directories. These links likely serve as lures to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/0qom45skak3gvjm66qbijrmrfa/dulofixojewop.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609840c809f69---bapefudezowa.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/92278853889.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ae287e501050948a50cfde97658aae93/39957922383.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7e0d61b63---jupariwezogixuxujinap.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a18e3723f---61904135164.pdfIn PDF document text
    • http://emeat.ru/var/files/fitupakemuverexugar.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072b4dd75d34---18433673526.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/98973489828.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/39235302957.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/poporojom.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/boduzolunagimavoxofiji.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a8daf696856---67103957206.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/kamisakel.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/067a14df93a9b411bf9c63531e18dd5b/fuwupekevifopaxapifubuxi.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/68634609919.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/p8sl197vs65aj1uq7if47m1v2p/wakabuno.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a9af69e78---detizupewava.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/46997756081.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/45600108947.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/juxuzexetupogulologasaz.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/chhnrshh7u362njdosdch9ak07/97773155114.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/dewuwejanugefidilinaduf.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/zeperizizaforid.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/nakiteganutet.pdfIn PDF document text
    • https://iword.de/userfiles/file/gebasewokiwuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=10+most+expensive+houses+in+the+worldPDF 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_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 10928 bytes
SHA-256: d7fa415413742a29db855418b7fe10f303326bcd64474fb795a92beab8a1aff4
font_01_sfnt_off000118ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FF 17456 bytes
SHA-256: 8a62083edbe123cc9cda0e176eff0f217a7e5abb1a2b9b0da7f12a0a77c8d905