PDF malware analysis — malicious · bd39ec13d00048a9

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 02:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 56d49ba46fab9a3e5d224726f941fd18 SHA-1: 0e9dcba92ddc610bbd8ee9626cede661301fe4c5 SHA-256: bd39ec13d00048a9b3c3dce1ef36d4544b95807649764c39cb7c54c7e18bea1e

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 Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's purpose appears to be facilitating initial access through a phishing attachment, potentially leading to further exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=livre+algorithme+informatique+pdf PDF link annotation
- https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/mu1sibamvu2gp42ib249gv4u57/7068820220.pdfIn PDF document text
- http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/1687986731.pdfIn PDF document text
- https://www.dars.bg/ckfinder/userfiles/files/82486822952.pdfIn PDF document text
- https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/20bf27bc4d677deb5c0488d7ec2a4d6c/kitokagurado.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b1294d9264b38fc63f4c4c3ecb5e8613/zuluzejenimibaxanogaronis.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160928b983c50f---37504457552.pdfIn PDF document text
- http://onnetsolution.in/userfiles/file/52529779082.pdfIn PDF document text
- https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/61dcefded9536865630329fe99888b0d/25097658263.pdfIn PDF document text
- http://studiotecnicofrisoli.com/userfiles/files/81526671728.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d588717551---1638674412.pdfIn PDF document text
- http://cleangroupbd.com/ck/upload/files/12620261863.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5e9e9ce036e40d71a00ef42266d6a781/37460852523.pdfIn PDF document text
- http://matsonconstruction.net/userfiles/file/migejulodi.pdfIn PDF document text
- https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a27ff66fd684f509a8250144b8d2ff27/dimejozugej.pdfIn PDF document text
- http://thessalonikiflights.com/files/files/jisolepapef.pdfIn PDF document text
- http://life-homeshop.com/asset/uploads/files/44987057986.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6406c4faea0ace242c1e5766fe75b450/kuluwolezoze.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/6f006c63577466e36bbd127a2e189167/vupukifagesupareperoxede.pdfIn PDF document text
- http://tubemakingmachine.com/uploadfile/files/tonijerowi.pdfIn PDF document text
- http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160febf1be1d1c---sodejuf.pdfIn PDF document text
- http://krikrik.ru/uploads/ckfinder/files/wokizegawitosadulapid.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b2fe0cb3b---60287920848.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089058337813---leriwufulobil.pdfIn PDF document text
- http://awards.nl/img/cms/file/37829346895.pdfIn PDF document text
- https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a3c7daa7bb248cc8ec9a611088031c31/womefizimowufarininumux.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_off0000e3b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3B4	11048 bytes
SHA-256: `fcc272e0a0ebc0fa341793a06ef1adb7a14afd24a24d7cc43949dbecc0202f16`
`font_01_sfnt_off0000fca4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCA4	19492 bytes
SHA-256: `85197dd9dfdaf253968347a427492d5d3752484bc252ca97f4f420e129822f15`
`font_02_sfnt_off00012de4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DE4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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