PDF malware analysis — malicious · 9fb49b0a0fc3c33c

MALICIOUS

PDF

75.1 KB Created: 2021-09-08 08:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: e842e0c117bac6a43edca8482b81ca22 SHA-1: 3d4a867f4395f7545ab3ba03a835f9a77dbe9d73 SHA-256: 9fb49b0a0fc3c33cad54904fe60aa895da2fb58a66e3b0b72ba8fc96b4c9c57d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=therapist+aid+worksheets', are likely used to distribute further malicious content or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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 https://smidgel.ru/uplcv?utm_term=therapist+aid+worksheets PDF link annotation
- http://vinhhangvien.com/upload/files/raripazara.pdfIn PDF document text
- https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/380530be1e2b263c65718e357ce82e23/77716208370.pdfIn PDF document text
- http://growourworld.com/clients/83159/File/94617906058.pdfIn PDF document text
- http://masterref.ru/editorfiles/file/baxonaveko.pdfIn PDF document text
- https://www.zolmedis.lt/ckfinder/userfiles/files/94823436332.pdfIn PDF document text
- http://bandenplaats.nl/cmsimages/file/ditujikugur.pdfIn PDF document text
- http://investin-khj.ir/ckfinder/userfiles/files/74564087469.pdfIn PDF document text
- http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mezalimumuzikasodureved.pdfIn PDF document text
- https://kaptenhoki.info/contents//files/tijidojuledebemik.pdfIn PDF document text
- http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/nefegoxadoza.pdfIn PDF document text
- https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4c79096337c4ef1e3c529ead51f08725/zulezasupevifasetivurux.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161193195d9929---35515801459.pdfIn PDF document text
- http://gnatowski.pl/attachments/file/tuzuvugesemig.pdfIn PDF document text
- http://tentauto23.ru/ckfinder/userfiles/files/kafupomegajenif.pdfIn PDF document text
- http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/wiberapusitiwupiram.pdfIn PDF document text
- https://ecohort.info/userfiles/files/risizudunido.pdfIn PDF document text
- https://jgranit.pl/userfiles/file/55297436097.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/0d863aa5c3beb318f73012fab7dc3774/saloladex.pdfIn PDF document text
- https://newtech-utm.pl/userfiles/file/gejowufugizutitofi.pdfIn PDF document text
- https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/363426d4376da4973834354c78d440b6/42079852262.pdfIn PDF document text
- http://www.awakohchang.com/image/upload/File/ofosolasapuxezib.pdfIn PDF document text
- http://noithattamphuong.com/upload/files/tuvubofur.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161160a161aeef---nipoxumutoni.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ed5a81dfd---fewiwudanu.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac3aba34c---16105233580.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_off0000c5ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5AC	16176 bytes
SHA-256: `89daa974737c5d129dce374b512e179a72c144c434cd0c2d8306917efa023286`
`font_01_sfnt_off0000ef20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF20	10480 bytes
SHA-256: `835660bd9b1ed2000337419c7612afc438ab135c93e07c3c8bc1d0a370e802e6`
`font_02_sfnt_off0001072e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1072E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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