PDF malware analysis — malicious · eec5984381c8d401

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 15:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 97e5a4362d4893ad10e5372329b89ebc SHA-1: 5ce9fdc60836c6ef4e09b4a04f687ea659a0417c SHA-256: eec5984381c8d4012df42bd8ef994a7242b92919495ad9b24cfed09ff91bc40d

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. It contains numerous external URIs and links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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=the+brotherhood+in+saffron+pdf PDF link annotation
- http://tecnoservizi.com/userfiles/files/91459076280.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160794b4780f8b---67281173513.pdfIn PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/760c7dd79bc0033de0ae02cbcba2b780/kifizixut.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/c637bd562839904fc361e19891b88f84/duvibenetul.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee36782172d---46548685160.pdfIn PDF document text
- http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe6644fa9---19940580243.pdfIn PDF document text
- http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kikiji.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba09b7a73da---xaradibid.pdfIn PDF document text
- https://floresdeserrezuela.com/aym_image/files/zaxebedokimeno.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1487ce3c1d---jawubu.pdfIn PDF document text
- https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/51b15b31693b888f52a3681e4ecad372/zabelisuxo.pdfIn PDF document text
- http://jezirka-biobazeny.cz/UserFiles/File/85242680387.pdfIn PDF document text
- http://royalrep.com/userfiles/files/52477835835.pdfIn PDF document text
- https://flyingfish-stay.com/userfiles/file/davunudiveletatitano.pdfIn PDF document text
- https://www.agencesramos.com/ckfinder/userfiles/files/gibumob.pdfIn PDF document text
- https://motoquadro.de/userfiles/file/99171976564.pdfIn PDF document text
- http://fygl.net/uploads/file/180357562058.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccc8712cb5---bisimiguxoxudasixejo.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb088e51f6---37287492971.pdfIn PDF document text
- http://zulaikhatextile.com/userfiles/files/vonurivefifowetajasuxuzos.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/60240326964.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b422e469a2---78306669840.pdfIn PDF document text
- http://gz-theoutfit.com/UploadFiles/FCKeditor/20210825141309.pdfIn PDF document text
- https://dailyhondaotomientay.com/upload/files/90494897481.pdfIn PDF document text
- http://eis-pieschel.de/UserFiles/File/5742550061.pdfIn PDF document text
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808199c7ca3---84889850014.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_off0000c1d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC1D8	16700 bytes
SHA-256: `48230eda8f1121bc128c373daaca503b704017d549fbf52aad35c9fcee4f1032`
`font_01_sfnt_off0000ed0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED0E	10652 bytes
SHA-256: `2bb7f1868fb6a40d6d65a5737e9784738d9d848a541692242012978d4e52a0c5`
`font_02_sfnt_off00010525.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10525	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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