Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84c39515f3c89c4…

MALICIOUS

PDF

77.9 KB Created: 2021-09-04 17:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11e6cfffb2a7ed754cb9274099c67216 SHA-1: 48142aaa2e0e1bcd81df24efab18464628e9b935 SHA-256: f84c39515f3c89c46c2c10da8ff918f2a6b4da0feab4521dda26745603e93904
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, likely intended to lure users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The file's structure and numerous external links suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://ranaghatpchsschool.org/userfiles/file/wogiraxatolo.pdf In PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dff1facf63af10ad30119fe10b6da408/48053508123.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/9623a2ee04954481192e8b677140bb7b/jesonatevitefalukifupetex.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bce30d939---bonefuremitug.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891733f9ce---piwidevuxanasuvimewudoli.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/benokixuzijimilerurek.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/pugidowovalunimofup.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/8709996618.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/velepabonisaxonos.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/bikikasur.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/bonizugepa.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/pekasurur.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/kutope.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/345120599.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8864404ea---fobevosedajo.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/182715379.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46d67bba4e---42266804249.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919a83bef50---95402024137.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b109244084---50895185995.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/84182486110.pdfIn PDF document text
    • http://billsky.ee/files/file/taxepuvegofevujovomulovus.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608318e530571---gidud.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210703_092544.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/54357761834.pdfIn PDF document text
    • https://nevisnews.com/userfiles/82648799050.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/zijiwaxejikusedexuso.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4bd6c0ef9e1ecb782fe3c08c513f40f8/vugesojitaxijigatavawuf.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c1eacfd31---29361688160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=computer+science+notes+pdf+free+downloadPDF 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_off0000cafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 10996 bytes
SHA-256: 0fb26c61c029c4119b117838ec4091593fbe1e8ef2024dfbfd1fce663c153a38
font_02_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 17392 bytes
SHA-256: 2a116a8ba2d28e18c25a3922d6cda06ce618832db2cec953689b348fe8d7d535

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