PDF malware analysis — malicious · 1f63be4b65017317

MALICIOUS

PDF

89.5 KB Created: 2021-09-07 01:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: eb08b25bdfb21f9fd7252ae7e07aaf04 SHA-1: a3c10a644c341f31917ca1fbd59b4b493a98ea31 SHA-256: 1f63be4b650173172598a48212a664cf38d571d9ef13a96e2fc135001499ad42

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

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 contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to direct users to malicious content. The presence of external URIs and link farm indicators strongly implies a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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 http://mikailang.net/userfiles/file/20210506162541_350395162.pdf In PDF document text
- https://globalmediaminds.com/uploads/files/tafagijobafe.pdfIn PDF document text
- http://tachikawa-derma.biz/ckfinder/userfiles/files/78961230140.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa0b04d92---38869944782.pdfIn PDF document text
- https://songhongresort.com/img/files/4150976093.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/fc0db4b588f154c057f9c9492c99a0c0/miwerevaredajanifitupevi.pdfIn PDF document text
- https://fasaac.org/temp//files/sujupiduwipala.pdfIn PDF document text
- https://safetypadlocks.eu/eurostyl/photos/file/91354403450.pdfIn PDF document text
- https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/56f58961a6679726bcd24b3810471f8b/gotinume.pdfIn PDF document text
- http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71c2e5020---latepimipozugunesumu.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d29a9ce44e4---42138949498.pdfIn PDF document text
- http://longarmacademy.net/fckeditor/userfiles/file/gidojipebanitu.pdfIn PDF document text
- https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160708c7d56142---lafofefazeratalu.pdfIn PDF document text
- https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/fa907087802f5dd9e9728c05328c2ffd/faruner.pdfIn PDF document text
- https://sharadsangam.org/UserFilesTwo/file/14421620498.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5c0c26886f3b3e454c5cb0ed07f0becf/xebekede.pdfIn PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ad160a60b---38635080678.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b31bf1289---vepuwuxopa.pdfIn PDF document text
- https://taechoclub.com/FileData/ckfinder/files/20210803_413E3653DD94F9B9.pdfIn PDF document text
- https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/e9107d956615650d7457a2c4f8449729/fuzuposuzafobonusod.pdfIn PDF document text
- https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/4lkc9igbr6pk5ka5hoa40misv5/vugelujelovogaroxezalig.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b858228b---99118749330.pdfIn PDF document text
- http://namngonviet.vn/user-/files/82915131515.pdfIn PDF document text
- http://myslizdrave.com/soubory/surapaj.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160908535323d6---wufokimujapov.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=excel+worksheet+l%C3%A0+g%C3%ACPDF link annotation
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cd98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD98	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e5a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5A9	16568 bytes
SHA-256: `73ede0d9492833b8588a4f896ef44768e605b4a4a73078ff0cc910f7021e14b5`
`font_02_sfnt_off0000fce5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCE5	10660 bytes
SHA-256: `c3b2e729119e654ace5ef9804455ec943831fa05d8be33f5f90d0487b3cbb87f`
`font_03_sfnt_off00011598.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11598	25908 bytes
SHA-256: `cc639ee97b55b58663898bad740dc7981d03920df99b23031a282f661b7c1558`

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