PDF malware analysis — malicious · 4af9dbe7df0664fd

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 04:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3d5ebe298ce781047774677db0c328fc SHA-1: cc5a6df9342e59960b2f5047db308e44639d7c4b SHA-256: 4af9dbe7df0664fd13b4f6e253b86433685d7a10830d1b159ce7b9927bcbcf55

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

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://hornets88.com/clients/56662/File/66276872227.pdf In PDF document text
- https://tecnibat.net/uploads/archivos/nitep.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae729f558a9---kilavexenolasuvi.pdfIn PDF document text
- https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/38e223ded53f61fb5c086ada44949b09/46962883294.pdfIn PDF document text
- http://designbeginnings.com/upload/file/teluxa.pdfIn PDF document text
- https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/fexoremimen.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160baad5e66f53---28619917869.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba68d3d65be---totolevisazifiwet.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f51eb3b500---87348844609.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608658b836571---76979637379.pdfIn PDF document text
- http://gpsputhuppally.com/userfiles/file/20709794966.pdfIn PDF document text
- http://dagmare.de/userfiles/file/xesepabuvekulo.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160777b0c981aa---zuwididumesise.pdfIn PDF document text
- https://zoorichi.com/temp/fckeditor/file/46486293443.pdfIn PDF document text
- https://steklo-shik.ru/userfiles/file/17543427948.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c83fe3247---93722416224.pdfIn PDF document text
- http://writtenmail.com/upload_images/file/53970063213.pdfIn PDF document text
- http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c5868d0bf7f5dd92f68f74b552bfed18/vugitirozosugoputuwigug.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc0256235a---82003301744.pdfIn PDF document text
- http://struttur-arch.it/userfiles/files/60797990757.pdfIn PDF document text
- http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/39958420373.pdfIn PDF document text
- http://thegioimaychaybo.com/app/webroot/uploads/files/88034341766.pdfIn PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/31751bdbf87e27cd2203b180df01e222/2025116157.pdfIn PDF document text
- http://suriyedostlukdernegi.org/image/files/dulogegiredutivelafesoxom.pdfIn PDF document text
- https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e0cbdf35b58be0f1570e978e68875c89/5030585294.pdfIn PDF document text
- http://studiolaviano.it/userfiles/files/bovoluwumizelaxoz.pdfIn PDF document text
- http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/55687953451.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=next+to+preposition+of+placePDF 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_off0000d62c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD62C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ee3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE3E	17152 bytes
SHA-256: `be99a449b339fdc44a41575483693b2b3b6564779294f5818fba2893404e8e92`
`font_02_sfnt_off00011a4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A4F	10552 bytes
SHA-256: `a7c9f90728d54e126cea400d711b88dd582495710018f9a1dc0ac67759201a4c`

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