PDF malware analysis — malicious · 23dcbad7a1735e85

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 13:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9dcb2db506f2c8d1e56c2567b9a131a2 SHA-1: 766c95ec070572af26f6a2848035b6cc98807b10 SHA-256: 23dcbad7a1735e85e600c2a4d29371a76c35d99a0c9cb3335d5d5d5fc04700b2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating it functions as a link farm. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to download further malware.

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://kingyao.com/uploadfiles/files/20210621_055900_5521.pdf In PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad85c0ba62---vamipus.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c16180cec041a811cfc76c2504a66f44/vekux.pdfIn PDF document text
- http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d16e0315---4350842361.pdfIn PDF document text
- https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/inpbbm05ghotm8orc2dq8kbm3p/82915839858.pdfIn PDF document text
- https://www.dgaspcsm.ro/ckfinder/userfiles/files/pefudawuturot.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/50786e82a7a4e592a6cd74c423b16918/lizulosigiburujujol.pdfIn PDF document text
- http://josquin-capella.de/download/2221752744.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa7280e1a9---forexisozulivames.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/roddggou5g1r4uc8vuppolp55k/59224125924.pdfIn PDF document text
- https://uzmanwebci.com/calisma2/files/uploads/dijojawawusirosesixiv.pdfIn PDF document text
- https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/22165643727.pdfIn PDF document text
- http://srhs1980.com/clients/877094/File/gakonuzasugevegefor.pdfIn PDF document text
- https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ade02384a3b73b2c4d4fedf50defdb4c/47784888740.pdfIn PDF document text
- http://chinawin-consult.com/userfiles/jedawulumad.pdfIn PDF document text
- http://xn--3bsx3iw22bmot.com/filespath/files/20210816214544.pdfIn PDF document text
- http://abyss.sk/userfiles/file/28924130196.pdfIn PDF document text
- https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/83c4ec129539278633c77385225a023b/zuledep.pdfIn PDF document text
- http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b3f929b4---75632170880.pdfIn PDF document text
- http://dobrasekacka.cz/userfiles/file/zatidumuvogirakade.pdfIn PDF document text
- http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84603293504.pdfIn PDF document text
- https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/633cbafe760e94c4f9e778b253d5be22/golimodugivazusemotog.pdfIn PDF document text
- https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/ebf6516221084bdfa08ffadd014160a7/jopefajewerubarerufopiki.pdfIn PDF document text
- http://www.siphonicflowmandiri.com/upload/files/kezuvuda.pdfIn PDF document text
- https://giolog.biz/images/bulk_images/files/wobejivo.pdfIn PDF document text
- http://scoutpate.com/userfiles/file/kubapiwotemosulijop.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=empresas+transnacionales+pdf+unamPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fbd6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBD6	10864 bytes
SHA-256: `16443979d41eeedbcbddef7f8b5230d5ef72aad797d10659f72e9073054ec9da`
`font_01_sfnt_off000114e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114E7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012cf9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CF9	20568 bytes
SHA-256: `e76e4bb569e134d7626f09745b2178109fc896126ee584a7c78be68ddfc1632b`

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