PDF malware analysis — malicious · 22c1bbaf128b20c9

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 14:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 8a47e3869ce539b45e3eafe1064d13b6 SHA-1: d9e438ddd1fdec47ac8417494fa1e0e3d4a88f51 SHA-256: 22c1bbaf128b20c9f741172b8c4cc88d44e4f9cfdc811ebd8a162f6c3dbf425c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL patterns strongly suggest a phishing or downloader attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5e00e5d8a---85057154339.pdf In PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f69153edd---tudalopegelukiwutalufi.pdfIn PDF document text
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/4uf5dfb3bbfrgbn3dvnkdi8p1a/texixebuzowokazurawime.pdfIn PDF document text
- http://kocavietnam.com/upload/files/55159114472.pdfIn PDF document text
- http://hyosangjo.com/userfiles/file/20210610203642.pdfIn PDF document text
- http://baobiachau.com/luutru/files/41621468431.pdfIn PDF document text
- https://recapress.com/ckfinder/userfiles/files/vezove.pdfIn PDF document text
- https://dacola.com/upload/files/91946969451.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/79b98af53accfde57176ae41042f6c93/5516655425.pdfIn PDF document text
- https://clubon.top/uploads/files/59806487617.pdfIn PDF document text
- http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa94f6a63d0---26989921859.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/10853483027.pdfIn PDF document text
- http://www.celso.org/download/kekudenopetakazimivim.pdfIn PDF document text
- http://dj-maily.com/uploads/pages/files/xifenikibigi.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/908f32cba84ddc4d9a5c63867c029219/zoxabupezozaxokijetoron.pdfIn PDF document text
- https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/47213c006b20090c7c7afb6d2ea3253f/3307108029.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8557023250---monibawubeburaloxivenowo.pdfIn PDF document text
- http://tunglamgarden.com/images/fck/file/marogutudulazagulopasi.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ac781acc3---xigagawerilidenumilat.pdfIn PDF document text
- http://dent-pro.cz/pic/file/47293910759.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae199b8814f---jenuxixawetaxadazilusomu.pdfIn PDF document text
- https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/8fc762c602e755a6905ada1fba7acb09/vajetifevazetixapilifif.pdfIn PDF document text
- http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64831031999.pdfIn PDF document text
- https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/bad34ac7569979b38c89677cc390bdd2/98514321677.pdfIn PDF document text
- http://daindnc.com/fckeditor/userfiles/file/duwumikagewegozaminamera.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=esrarengiz+kasaba+g%C3%BCnl%C3%BCk+2+pdf+indirPDF link annotation
- http://s292376414.onlinehome.fr/datas/imgmail/file/24058574767.pdfIn PDF document text
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770e37d8fa6---tazepimokomolo.pdfIn PDF document text
- 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_off0000e0f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0F1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f903.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF903	18612 bytes
SHA-256: `64519a6949bcd1474d9511d02dfdb1e347605e8d4d1578b93388a8c30bf33929`
`font_02_sfnt_off000126ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126CE	11040 bytes
SHA-256: `687c849ce77dceabdbd9b69ae8595c6275c306207f0d647e027b211bef30991e`

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