PDF malware analysis — malicious · 841a1ad13ff8ebba

MALICIOUS

PDF

85.9 KB Created: 2021-08-23 16:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: be18484b9efcb4c5a974e7a0a8026d05 SHA-1: df1455ebcfe6a03573ad7d17675370ea8cdf0024 SHA-256: 841a1ad13ff8ebbaa739e8615eaa6bc758c503a7028c0aebc11246f7cae15fe9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://krisoc.ru/uplcv?utm_term=what+is+rubbing+alcohol+made+from PDF link annotation
- http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088e99417123---silidade.pdfIn PDF document text
- http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4dfd7bf84---15446344693.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757eaa9c731---xupabo.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/97f592d69a6fa42491bd60d87d2973b3/ranazozed.pdfIn PDF document text
- https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ae3bc3cb9fe9b881979f69fe9ad57117/45699460189.pdfIn PDF document text
- https://blugarden.eu/file/93499599608.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda074343b---lanerikutavevigazurivunas.pdfIn PDF document text
- https://peterdegendt.be/file/71432526782.pdfIn PDF document text
- http://andlupa.com/userfiles/file/wikefunu.pdfIn PDF document text
- https://espaciocultivarte.com/ckfinder/userfiles/files/mebizugevu.pdfIn PDF document text
- https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c4a47141ca83b2ad5327f3554426aa42/vojivitimedunukum.pdfIn PDF document text
- https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/2295ac19c0878e7dc50d13398cb6c1d7/zolewobuxekemijenag.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1085bd546a---86680346166.pdfIn PDF document text
- https://pass-eco-energies.com/ckfinder/userfiles/files/50317346400.pdfIn PDF document text
- https://anpheatingandac.com/nbloom/fckuploads/file/kafemofitived.pdfIn PDF document text
- http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/im1a0utjfjd08c03ej4tt6occc/95562247401.pdfIn PDF document text
- https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/835354209135890c0d563a11b59a911d/85335935847.pdfIn PDF document text
- http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/52046477184.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/49cc38b005d6f26835e04d84e3dfca7c/20516325607.pdfIn PDF document text
- http://keacg.com/upload/files/korofopidapinexaj.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a7d7a752d7ccb61bf73d6649b0e79e36/23729825346.pdfIn PDF document text
- http://asesorgubernamental.com/images/file/46238176027.pdfIn PDF document text
- http://tokstar.com/_UploadFile/Images/file/biniwesu.pdfIn PDF document text
- http://www.bluewhaleline.com/image/upload/File/10802449812.pdfIn PDF document text
- http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fb0f849ade0413c2bcc1cb594788426b/sekixulopusigowumumuj.pdfIn PDF document text
- https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/087991b0e3bc08f1bc83124b6c64d083/83870621240.pdfIn PDF document text
- https://kclandscapes.com/ckfinder/triplebuserfiles/file/65785085718.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_off0000ecfe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECFE	16500 bytes
SHA-256: `f9136410080cde09e64dd3967b3afb969bd2e02aa9320ae47a4a764c93dcdfec`
`font_01_sfnt_off000117e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117E7	11156 bytes
SHA-256: `dfb0fceb5bded2453ade177701bcbb4a177a75b9b5aeedfc926b7eed21befcc2`
`font_02_sfnt_off0001319e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1319E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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