PDF malware analysis — malicious · 6a989b1bd6a4b83a

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 15:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: b3abc75496b9b9644b947b05f1d44fd3 SHA-1: d14e57a36f03b5a615ddd24eb63c381882ae750a SHA-256: 6a989b1bd6a4b83a62bf91e8f7c3856e493c35e25057bf1a1a28b9d5de8b09eb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9834

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://laborke.ru/uplcv?utm_term=algorithm+design+and+applications+by+goodrich+and+tamassia+solutions+pdf PDF link annotation
- http://bumsnab.ru/uploads/files/bifusoji.pdfIn PDF document text
- https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/62ad30e0cbe5cc80c837b5a3e34f93a1/47193751639.pdfIn PDF document text
- https://techson-cctv.com/upload/file/zigobopugufozodanafe.pdfIn PDF document text
- http://7166867.ru/ckfinder/userfiles/files/15228713741.pdfIn PDF document text
- http://srividyaastrology.com/userfiles/file/34028477176.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0496911f9a---19445872713.pdfIn PDF document text
- https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/05328e359bb3470a9ecd0dc8d28452ad/vagixarilewidi.pdfIn PDF document text
- https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/043881934d83972362a6b02cedf9f6c8/kokadoxi.pdfIn PDF document text
- http://travelspace.pl/userfiles/file/vubuko.pdfIn PDF document text
- http://abwmechanicsville.com/uploads/files/meparoropapiw.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b30003b3d532c4b5903a0dcb94d66a91/27194083047.pdfIn PDF document text
- http://remobudostol.pl/pliki/23983053072.pdfIn PDF document text
- http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f008e41d631---bivajejibu.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae98df62394---36673303842.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c4545dd47---76028928361.pdfIn PDF document text
- https://prana.video/wp-content/plugins/super-forms/uploads/php/files/qbl3089a1sne2f56u9h02adtqh/bilizikenala.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/140b418e25bdc2f991bdfcae74250913/90437688538.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161005d7ceeb9d---22682004196.pdfIn PDF document text
- http://alburigiott.it/userfiles/files/69331267537.pdfIn PDF document text
- https://detectiveoffice.net/userfiles/file/84342264591.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96f9c3900---labelosa.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/86705914791.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2045579a411d615b794af09033e9432d/diradijudexivasuzali.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ef8217a9f992b4a3da497edfb4d8e02f/dudukelavab.pdfIn PDF document text
- http://klubalfa.org/img/userfiles/file/palarejefi.pdfIn PDF document text
- https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160807361cc32e---begixafebufudome.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160869b769d3d0---97818016249.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_off0000e35f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE35F	11404 bytes
SHA-256: `a46428e7d13205eccd674636780f70f1cce1ae1afcebf4d6e349068a4b6dc21f`
`font_01_sfnt_off0000fdaa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDAA	18420 bytes
SHA-256: `4d6dbd1a08603f44bf64e0077f19e182bdc5406cef7f877f0665ad2e19723052`
`font_02_sfnt_off00012e29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E29	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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