PDF malware analysis — malicious · 19a7f667fb48164e

MALICIOUS

PDF

71.1 KB Created: 2021-09-13 12:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: a023605ea928c96c9f14a81e49f93559 SHA-1: ed691dac37acac974effe6fa28deade109a3b276 SHA-256: 19a7f667fb48164e6db7475efd8ba988d90ebb4e7b1dc48b1ae4cd854c55c9ed

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised websites or disposable domains, suggesting a phishing or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is part of a link farm designed to obscure the final malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

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 https://allytemp.ru/uplcv?utm_term=android+volume+scheduler PDF link annotation
- https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vujpdi133cht08ojeihj5v4ncp/siriruvajik.pdfIn PDF document text
- https://0924055971.com/uploads/files/202109121853348014.pdfIn PDF document text
- http://godsownproperties.com/userfiles/file/xiwakubejovofoda.pdfIn PDF document text
- http://tokyoto.pl/UserFiles/file/80127022274.pdfIn PDF document text
- http://aotwresort.net/ckfinder/userfiles/files/38880878985.pdfIn PDF document text
- http://futimisdev.com/userfiles/file/bezeluxeput.pdfIn PDF document text
- https://mebelihome.ru/upload_picture/2025968865.pdfIn PDF document text
- https://mongolia-volkslift.com/uploads/files/wuboxubowigumekibowawa.pdfIn PDF document text
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c4655878---nezozajinezufafi.pdfIn PDF document text
- http://klpa.net/userData/board/file/6039388938.pdfIn PDF document text
- http://jianianhuayule.a9188.com/upload_files/art_files/files/20210906_163618.pdfIn PDF document text
- https://discovercefalu.com/_data/images/file/69617611999.pdfIn PDF document text
- https://sonerofset.com/userfiles/file/josatazirajevajukerugera.pdfIn PDF document text
- http://gelikonline.ru/content/Files/xuwovida.pdfIn PDF document text
- http://thietbimaugiao.vn/Images_upload/files/1315415892.pdfIn PDF document text
- https://my-natural-style.net/upload/files/danuwibagosuvube.pdfIn PDF document text
- http://2015.letnifestiwal.pl/ckfinder/userfiles/files/nukitivilanubuzunidus.pdfIn PDF document text
- https://dienmayminhchau.vn/uploads/news_file/roburodegifuv.pdfIn PDF document text
- http://findingthegrey.com/userfiles/file/69133874289.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130e61511dc7---pijoginuxisilusop.pdfIn PDF document text
- http://tochalco.com/uploads/files/siravale.pdfIn PDF document text
- https://majubesar.org/contents/files/11482969515.pdfIn PDF document text
- https://cuatudongsaigon.net/uploads/files/35413471522.pdfIn PDF document text
- http://shesob.com/file/files/werujilezibonepipa.pdfIn PDF document text
- https://poganyvolgyi.hu/userfiles/file/95535195847.pdfIn PDF document text
- https://noticky.net/akce/fotky/file/43932139184.pdfIn PDF document text
- http://thietbimaugiao.vn/Images_upload/files/wezolenaloxebarir.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_off0000b916.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB916	10524 bytes
SHA-256: `8ccbf6485c1ceb7447be8ed5a00a37303a58c843821070fa1d9abad8b8203a4c`
`font_01_sfnt_off0000d0d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0D7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e8e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8E9	14880 bytes
SHA-256: `802a69e93f324a8c803bb2b5a6eb293af1e8cee8c59bbe9f82950130f421a309`

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