PDF malware analysis — malicious · 4935e62196168679

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 12:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: d5aeac2b378548674f1040a7f03a1c5e SHA-1: e4b17fd3ab62176b130d29757e5f7151368824aa SHA-256: 4935e62196168679d86a6829c23d20e30095b0496434b8a776b4fc641e014acb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9780

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/isag9cpd83p7u3obdt0hna2q45/18147202894.pdf In PDF document text
- http://primaneighbors.com/userimages/feges.pdfIn PDF document text
- http://srividyaastrology.com/userfiles/file/selufipakarulosagiwoku.pdfIn PDF document text
- https://cepatdaftargroup2.com/contents//files/pixud.pdfIn PDF document text
- http://murphysbeads.com/clients/54316/File/93208673272.pdfIn PDF document text
- https://hoalavender.net/upload/files/44258832059.pdfIn PDF document text
- https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/0a42183e0b4a19c0bc70ff4e0be67905/88590846636.pdfIn PDF document text
- http://1day2night.com/UserFiles/file/rejeb.pdfIn PDF document text
- http://fantalife.nl/userfiles/file/62636704685.pdfIn PDF document text
- http://mikailang.net/userfiles/file/20210619124707_516064294.pdfIn PDF document text
- http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afb24565e82---polezejemutofit.pdfIn PDF document text
- http://masterref.ru/editorfiles/file/zaxijuretuzule.pdfIn PDF document text
- http://harryreichert.de/uploaded_pics/News/file/43037575026.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f2655ef3aa281ce90eddd7f725e18d8f/97348391665.pdfIn PDF document text
- http://qiangka.com/ckfinder/userfiles/files/xalarafozofazinax.pdfIn PDF document text
- http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5b6732e5a---gexazovutanulake.pdfIn PDF document text
- http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c80cb6c3---71597922930.pdfIn PDF document text
- https://readandenjoy.ae/userfiles/files/21769988402.pdfIn PDF document text
- https://ystechpro.com/nbloom/fckuploads/file/ladoxorekuxubimuzedu.pdfIn PDF document text
- http://llux.vn/uploads/files/17426767355.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd2240c7ca---tafegudanarimadipiliku.pdfIn PDF document text
- http://verypool.cn/images/upload/File/kozepipux.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160719eeb38812---20142160502.pdfIn PDF document text
- https://nomortiga.com/contents//files/dodosugapanef.pdfIn PDF document text
- http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e45b2846c---1778639668.pdfIn PDF document text
- https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/68327518fdcf316d35f84a376effae1f/gujujajojuzutesu.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=retsch+pm100+manualPDF 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_off0000cdeb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDEB	18440 bytes
SHA-256: `a58280698d583eab4953253e2859844b642655b15a852f732c1b722dd9c52708`
`font_01_sfnt_off0000ebb1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBB1	10648 bytes
SHA-256: `8343118bc6f3fbe78b49b1c6a6bc4ff394734a77fc3971e5685f97144671d95a`
`font_02_sfnt_off000103fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103FB	15552 bytes
SHA-256: `2b41cacc8f5596c2ec0d80d30f016de0d99adb4553f716ef397666dfea594acb`
`font_03_sfnt_off00012bcd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BCD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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