Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7d4a3f9f61dc9f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 14:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e403becbb5622ad51c61294be10bea36 SHA-1: e3cf1be290396a5b7d217bcb370d490d27984d18 SHA-256: cf7d4a3f9f61dc9f528551e26938c03c540b47909469207724fbf9ac6b2083dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://maschimaurizio.it/userfiles/files/koxolavovozolujemisowusib.pdf In PDF document text
    • http://inspiredindianfoundation.org/uploads/nikuninefivorurixusa.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/bcbb8cda95598508cf988a3207b752e9/nuzijukiwojazogodulubun.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210502193031244547gmnwf1.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/14537545531.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f175ea9a6c---dular.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/gozumemov.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853435be179---98139184744.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088e6c8bc26b---lakukofugi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ff0b18342---72225939003.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/71718613311.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/34781283996.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5d2b5273adc012c9e1d84c645f344d9a/60909690390.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb90d814098---teretisegadopejugima.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d04a4f9a2---40332706344.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb55694e0---bumowagob.pdfIn PDF document text
    • http://mobilenmr.com/files/files/niniw.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/sopopiwegiguzazomomej.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/pun9uotf353rp0crg5svvskrg6/27510478193.pdfIn PDF document text
    • http://firegallery.ru/img/upload/kivujafegimusezas.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/tulepilam.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/xapikos.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/kupijido.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c5c6895b---mojumuzibi.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/44805596647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=s+m+l+xl+pdf+onlinePDF 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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 21120 bytes
SHA-256: 40bf04c954d2e803c48061ab2bc60adab0cb09e4a46f96905810fccbeb0f6b6c
font_01_sfnt_off00011993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11993 10308 bytes
SHA-256: df83299ee7b031c77c87641367e7a92d87c21d61daf0a8dca74b8f0c6df36c4e
font_02_sfnt_off000130b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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