PDF malware analysis — malicious · f71cbd205e71eaf6

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 05:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 3709ec09c40f44a58c8535e2da324492 SHA-1: 5e8587cd46bb56b2e3f61541cc7527a54663120b SHA-256: f71cbd205e71eaf617e6539445267c88457013161e7d26a15a390888eccae767

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://digitalpolicycouncil.org/imagenes/file/73275605490.pdf In PDF document text
- http://dolphinkorea.com/files/files/busutezukususoge.pdfIn PDF document text
- https://efckrakow.pl/userfiles/file/50165132988.pdfIn PDF document text
- http://gwardiajuvenia.pl/zdjecia/fck/file/52748712991.pdfIn PDF document text
- http://cungcapbaoduongcuanhatban.com/upload/files/69215314136.pdfIn PDF document text
- http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161440714d15e7---63472265193.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe05a9eb97---77921956362.pdfIn PDF document text
- https://lesartsdansmonjardin.com/userfiles/file/20210929045022.pdfIn PDF document text
- https://tadimtursu.com/image/files/73563211449.pdfIn PDF document text
- https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6b2fccbb325dde78d8dfe1990f5937a8/56369815226.pdfIn PDF document text
- http://teleserviciomalaga.com/ckfinder/userfiles/files/6949638856.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb1bf9256c---4616370093.pdfIn PDF document text
- http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/vovigebuvorafasiwoxipa.pdfIn PDF document text
- http://universalestetic.com/userfiles/file/89372479237.pdfIn PDF document text
- http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16158a018d73cb---4492854924.pdfIn PDF document text
- http://inbjnews.com/data/cheditor/0603/files/sijanixitofesofujibitu.pdfIn PDF document text
- http://szyqjsj.com/UploadFile/file/20211001140414621.pdfIn PDF document text
- http://kimhoatra.com/upload/fckimagesfile/pilifapaxuporamajuru.pdfIn PDF document text
- https://amt-alarmy.pl/userfiles/file/65391930879.pdfIn PDF document text
- http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4a08cff2e---82157210854.pdfIn PDF document text
- http://xn--q20b13r9leepaeb.net/upload/file/202109090033159595.pdfIn PDF document text
- https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/lafupovugeliketo.pdfIn PDF document text
- http://sevoir.hu/uploads/file/23540128180.pdfIn PDF document text
- https://renesens21.com/ressources/upload/files/17413881078.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=if+ticket+is+not+confirmed+then+refundPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b403.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB403	10676 bytes
SHA-256: `c7488fc357feb6e07b629384e2a569b24be973fbd3e7edefb008f282919ab500`
`font_01_sfnt_off0000cc51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC51	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e463.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE463	15456 bytes
SHA-256: `1ce7be5dddae2c3170e26fac312b733c7d3485628b1fad681c61fc842f8a388c`

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